3/28/2016

Supplemental Oxygen and Pressurization

PRESSURIZED CABIN AIRCRAFT (§ 91.211)

Above FL 250: At least 10 minutes supply of supplemental oxygen must be available for each occupant in the event a descent is necessitated by a loss of cabin pressurization.
Above FL 350: At least one pilot at the controls must be wearing an oxygen mask at all times unless equipped with quick-donning masks. When only one pilot is seated at the controls, pilot must wear the mask at all times even with quick-donning masks.
Above FL 410: One pilot must wear the mask at all times even with quick donning masks.

PRESSURIZED AIRCRAFT – BASIC COMPONENTS (8083-25 / AC 65-15A)

A person who applies for commercial pilot certificate with an airplane category rating and does NOT hold an INSTRUMENT RATING in the same category and class: “The carriage of passengers for hire in on x-country flights in excess of 50 NM or at night is prohibited:

PRESSURIZED AIRCRAFT (8083-25: 6-32 ~ 34)

In a typical pressurized system, the cabin, flight compartment, and baggage compartments are incorporated into a sealed unit capable of containing air under a pressure higher than outside atmosphere pressure.
Air is released from the fuselage by an outflow valve. By regulating the air exit, the outflow valve allows for a constant inflow of air to the pressurized area.
A cabin pressurization system typically maintains a cabin pressure altitude of approximately 8,000 ft at the maximum designed cruising altitude of an aircraft.
Pressurization of the aircraft cabin is an accepted method of protecting occupants against the effects of hypoxia.
* Terms
l  Aircraft altitude: the actual height above sea level at which the aircraft is flying
l  Ambient temperature: the temperature in the area immediately surrounding the aircraft
l  Ambient pressure: the pressure in the area immediately surrounding the aircraft
l  Cabin pressure: cabin pressure in terms of equivalent altitude above sea level
l  Differential pressure: the difference in pressure between the pressure acting on one side of a wall and the pressure acting on the other side of the wall. In aircraft air-conditioning and pressurizing systems, it is the difference between cabin pressure and atmospheric pressure.
The cabin pressure control system provides cabin pressure regulation, pressure relief, vacuum relief, and the means for selecting the desired cabin altitude in the isobaric and differential range.
The cabin pressure regulator controls cabin pressure to a selected value in the isobaric range (altitude) and limits cabin pressure to a preset differential value in the differential range (cabin pressure vs. atmospheric pressure).
The cabin air pressure safety valve: A combination pressure relief, vacuum relief, and dump valve
l  Pressure relief valve: prevents cabin pressure from exceeding a predetermined differential pressure above ambient pressure.
l  Vacuum relief valve: prevents ambient pressure from exceeding cabin pressure by allowing external air to enter the cabin when the ambient pressure exceeds cabin pressure.
l  Dump valve: actuated by a cockpit control that will cause the cabin air to be dumped overboard.

Decompression is defined as the inability of the aircraft’s pressurization system to maintain its designed pressure differential. The primary danger of decompression is hypoxia

OXYGEN SYSTEMS (8083-25: 6-34 ~ 35)

Aircraft oxygen is usually stored in high pressure system containers of 1,800 ~ 2,200 psi.
When the ambient temperature surrounding an oxygen cylinder decreases, pressure within that cylinder decreases because pressure varies directly with temperature if the volume of a gas remains constant.
The containers should be supplied with aviation oxygen only, which is 100% pure oxygen.
An oxygen system consists of a mask or cannula and a regulator that supplies a flow of oxygen dependent upon cabin altitude.

Diluter-Demand Oxygen Systems

DILUTER-DEMAND OXYGEN SYSTEMS (8083-25: 6-36)

Diluter-demand oxygen system supply oxygen only when the user inhales through the mask.
Automix lever allows the regulators to automatically mix cabin air and oxygen or supply 100% oxygen.
The demand mask provides a tight seal over the face to prevent dilution with outside air and can be used safely up to 40,000 ft.
A pilot who has a beard or mustache should be sure it is not interfere with the sealing.

PRESSURE-DEMAND OXYGEN SYSTEMS (8083-25: 6-36)

Pressure-demand oxygen systems are similar to diluter demand oxygen equipment, except that oxygen is supplied to the mask under pressure at cabin pressure altitudes above 34,000 ft.
Pressure-demand regulator create airtight and oxygen-tight seals, but they also provide a positive pressure application of oxygen to the mask face piece that allows the user’s lungs to be pressurized with oxygen.
This feature makes pressure demand regulators safe at altitudes above 40,000 ft.

CONTINUOUS-FLOW OXYGEN SYSTEMS (8083-25: 6-36)

Continuous-flow oxygen systems are usually provided for passengers.
The passenger mask typically has a reservoir bag, which collects oxygen from the continuous-flow oxygen system during the time when the mask user is exhaling.
The oxygen collected in the reservoir bag allows a higher aspiratory flow rate during the inhalation cycle, which reduces the amount of air dilution.
Ambient air is added to the supplied oxygen during inhalation after the reservoir bag oxygen is depleted.

The exhaled air is released to the cabin.

Performance and Limitation

EFFECT OF FWD / AFT CG

CG FWD
       Longitudinal stability increase
       Vs increase (tail-down force increased and to generate more lift AOA r required to be increased)
       Fuel consumption increase
       T/O distance increase (nose heavy)
       During L/D, possibility of nose strike
       Difficult to rotate on T/O
CG RWD
       Longitudinal stability decrease
       Vs decrease
       Fuel consumption decrease
       Difficult to stall recovery, even spin dangerous

ARROW AIRSPEED

Vso: 55 kts
Vs1: 60 kts
VR: 70 kts
Vx: 72 kts (gear down)
    78 kts (gear up)
Vy: 72 kts (gear down)
    90 kts (gear up)
Vglide: 79 kts
Vcruise climb: 102 kts
VFE: 103 kts
Vcc: 104 kts
VLE: 129 kts


X-Country Planning

PREFLIGHT ACTION (§ 91.103)

Before beginning a flight, PIC shall become familiar with all available information concerning that flight (under IFR or not in the vicinity of an airport)

Weather reports and forecasts
Takeoff and landing distance
Fuel requirements
Alternatives available if required
Runway length, slope
Known ATC delay
NOTAMs

CRUISING ALTITUDE DETERMINATION

Airspace, Winds, Terrain, Better TAS at high altitude, Cloud Base, and etc.

VFR CRUISING ALTITUDE (§ 91.159)

When operating above 3,000 ft but less than 18,000 ft MSL
       Magnetic Course of 0 ~ 179° odd thousand plus 500 ft
       Magnetic Course of 180 ~ 359° even thousand plus 500 ft

FUEL REQUIREMENTS (§ 91.151, 167)

a. VFR conditions
Enough fuel to fly to the first point of intended landing and, assuming normal cruising speed:
       During the day: at least 30 minutes
       During the night: at least 45 minutes

b. IFR conditions
Complete the flight to the first airport of intended landing
Fly from that airport to the alternate airport (if required)
Fly after that for 45 minutes at normal cruising speed

3 COMMON WAYS TO NAVIGATE

a. Pilotage: by reference to visible landmarks
b. Dead reckoning: by computing direction and distance from a know position
c. Radio Navigation: by use of radio aids

ISOGONIC LINE

Broken magenta line: equal magnetic variation

MAGNETIC VARIATION

Angle between true north and magnetic north

LOST POSITION: 4Cs

Climb: the higher altitude allows better communication capability
Communicate: use 121.5 MHz
Confess: let them know my problem
Comply: follow instructions

SPEED LIMITS (§ 91.117)

Below 10,000ft: 250 kts
Class B: 250 kts below 10,000ft
Beneath Class B: 200 kts
Class C or D (below 2,500 AGL within 4NM of the airport): 200

ELT NOT REQUIRED (§ 91.207)

Ferrying aircraft for installation of an ELT
Ferrying aircraft for repair of an ELT
Training flight within a 50-nautical mile radius of an airport

MODE C TRANSPONDER REQUIRED (AIM 4-1-20)

In general, the regulation requires aircraft to be equipped with Mode C transponder when operating:
a. At or above 10,000 ft MSL
b. Within 30 miles of a Class B airspace primary airport, below 10,000 ft MSL
c. Within and above all Class C airspace, up to 10,000 ft MSL
d. Within 10 miles of certain designated airports, excluding airspace which is both outside the Class D surface area and below 1,200 ft AGL
e. All aircraft flying into, within, or across the contiguous U.S. ADIZ

DVFR FLIGHT PLAN (AIM 5-1-6)

Defense VFR: VFR flight into a coastal or domestic ADIZ is required to file VFR flight plans for security purpose. The flight plan must be filed before departure.

CLASS A AIRSPACE (AIM 3-2-2)

Dimension: from 18,000 ft MSL to FL 600, including the airspace overlying the waters within 12 NM of the coast of the 48 contiguous states and Alaska
Equipment Requirements: Mode C Transponder, 2-way Radio Communication, and IFR Equipment
Entry Requirements:

CLASS B AIRSPACE (AIM 3-2-3)

Dimension: from the surface to 10,000 ft MSL and individually tailored for each airport like upside down wedding cake
Equipment Requirements: Mode C Transponder, 2-way Radio Communication
Entry Requirements: ATC Clearance, at least Private Pilot

CLASS C AIRSPACE (AIM 3-2-4)

Dimension: generally from the surface to 4,000 ft above airport elevation and 5 NM radius of core surface area and 10 NM radius shelf area
Equipment Requirements: Mode C Transponder, 2-way Radio Communication
Entry Requirements: 2-way Radio Communication

CLASS D AIRSPACE (AIM 3-2-5)

Dimension: from surface to 2,500 above the airport elevation
Equipment Requirements: 2-way Radio Communication
Entry Requirements: 2-way Radio Communication

CLASS E AIRSPACE (AIM 3-2-6)

Dimension: from surface to 2,500 above the airport elevation
Equipment Requirements: 2-way Radio Communication
Entry Requirements: 2-way Radio Communication

CLASS E AIRSPACE (AIM 3-2-6)

Dimension: controlled airspace not designated Class A, B, C, and D

BASIC VFR WEATHER MINIMUMS (§ 91.155)


NO VFR AUTHORIZED
18,000 MSL
5 SM 1,000 / 1,000 / 1 SM
10,000 MSL





3 SM
500 / 1,000’/ 1,000
(Exception: Class B Clear of Clouds)





NIGHT                      DAY

3 SM                        1 SM
500                           500
1,000                        1,000
2,000                        2,000

1,200 MSL
NIGHT                      DAY

3 SM                        1 SM
500                         Clear
1,000                          of 
2,000                      Clouds


Controlled Airspace
Uncontrolled Airspace

SPECIAL USE AIRSPACE (AIM 3-4)

Prohibited Area: Established for security or other reasons, aircraft flight is prohibited within this area.

Restricted Area: Contains unusual, often invisible hazards to aircraft, flights must have permission from the controlling agency.

Warning Area: extending from 3 M outwards from the coast of the U.S. Permission is not required, but a flight plan is advised.

MOA (Military Operating Areas): Designated to separate military training from IFR traffic. Permission is not required, but VFR flights should exercise caution. IFR flights will be cleared thorough or vectored around it.

Alert Area: Airspace containing a high volume of pilot training or unusual aerial activity. No permission is required, but VFR flights should exercise caution.

OTHER AIRSPACE AREA (AIM 3-5)

MTR (Military Training Route): Contain low-altitude, high-speed military training. The routes above 1,500 ft AGL are flown under IFR. The routes below 1,500 ft AGK are flown under VFR
4 digits: no segment above 1,500 ft AGL
3 digits: one or more segments above 1,500 ft AGL

ADIZ (AIM 5-6-1)

All aircraft entering domestic U.S airspace from outside must provide for identification prior to entry. To facilitate early aircraft identification of all aircraft in the vicinity of U.S. and international airspace boundaries, ADIZ have been established
The followings are required prior to enter ADIZ
a. Flight Plan: An IFR or DVFR flight plan
b. 2-way radio communication
c. Mode C Transponder
d. Position Reports: For IFR flights: normal position reporting. For DVFR flights, at least 15 minutes prior to entry
e, Position Tolerance
       Over land: ± 5 minutes within 10 NM
       Over water: ± 5 minutes within 20 NM


Certificate and Documents

PREVILEAGES FOR COMMERCIAL PILOT (§ 61.133)

A person who holds a commercial pilot certificate may act as PIC of an a/c

a. Carrying persons or property for compensation or hire
b. For compensation or hire

Commercial pilot must be qualified and comply with the applicable of the regulations that apply to the particular operation being conducted, e.g. Part 91 or 135

LIMITATIONS (§ 61.133)

A person who applies for commercial pilot certificate with an airplane category rating and does NOT hold an INSTRUMENT RATING in the same category and class: “The carriage of passengers for hire in on x-country flights in excess of 50 NM or at night is prohibited:

COMMON CARRIAGE (AC 120-12A)

Common carriage is to the carriage of passengers or cargo as a result of advertising the availability of the carriage to the public.
A carrier becomes a common carriage when it “holds itself out” to the public or a segment of the public, as willing to provide transportation within the limits of its facilities to any person who wants it.
There are 4 elements in defining a common carriage.
a. A holding out or a willingness to
b. Transport persons or property
c. From place to place
d. For compensation

HOLDING OUT (AC 120-12A)

Holding out is offering to the public the carriage of persons and property for hire either intrastate or interstate.
Holding out makes a person a common carrier
Holding out can be done in many ways, and it does not matter how it is done.
a. Signs and advertising are the most direct means but are no the only ones.
b. A holding out may be accomplished through the actions of agents, agencies, or salesmen who may obtain passenger traffic from the general public and collect them into group to be carried by the operator.
c. Physically holding out w/o advertising, yet gaining a reputation to serve all is sufficient to constitute an offer to carry all customers. For example, the expression of willingness al all customers with whom contact is made that the operator can and will perform the requested service is sufficient. It makes no difference if the holding out generates little success; the issue is the nature and character of the operation.
d. A carrier holding itself out as generally wiling to carry only certain kinds of traffic is nevertheless a common carrier

PRIVATE CARRIAGE (AC 120-12A)

Carriage for hire that does not involve holding out is private carriage.
Private carriage for hire is carriage for one or several selected customers, generally on a long-term basis.
The number of contracts must no be too great, otherwise it implies a willingness to make a contract with anybody.
A carrier operating with 18 to 24 contracts has been labeled a common carrier because it has held it self out to serve the general public to the extend of its facilities.
Private carriage has been found in case where 3 contracts have been the sole basis of the operator’s business, but the number of contracts is not the determine factor when assessing whether a particular operation is common carriage of private carriage; any proposal for revenue-generating flights that would most likely require certification as an air carrier should be examined closely if you intend to practice private carriage.
Examples
a. Carriage of the operator’s own employee or property
b. Carriage of participating members of a club.
c. Carriage of persons and property that is only incidental to the operator’s primary business enterprise.

CATEGORY, CLASS, TYPE (AC 120-12A)


Category
Class
Type
Certificate of Airmen
Airplane
Single-Engine Land

Certificate of Aircraft
Normal
Airplane


PILOT’S PHYSICAL POSSESSION FOR PIC (§ 61.3)

a. Valid pilot certificate
b. Photo Identification
c. Current and appropriate Medical Certificate ( for Commercial Pilot 2nd Medical Certificate required: 12 months valid)

CURRENT REQUIREMENTS AS A COMMERCIAL PILOT (§ 61.56, 57)

a. Pilot must have accomplished a flight review given in an a/c for which that pilot rated by an appropriately-rated instructor within 24 calendar months.

b. To carry passengers, a pilot must have made within the preceding 90 days:

1) 3 T/O & L/D a/c of the same category, class and type rating (if required)
2) If tail wheel airplane, must be full stop
3) If operations are to be conducted during the period beginning 1 hour after sunset and ending 1 hour before sunrise, with passengers on board, PIC must have made at least 3 T/O & L/D to a full stop during that period in an a/c of the same category, class and type

* Night Flight Time (§ 1): Time between the end of evening civil twilight and the beginning of morning civil twilight. All flight time that occurs during this period of time is considered “NIGHT” flight time

IS A COMMERCIAL PILOT REQUIRED TO LOG ALL FIGHT TIME? (§ 61.51)

Each person must document and record, in a manner acceptable to the Administrator, the training and aeronautical experience used to meet the requirements for a certificate, rating or flight review of this part.
They must also documents and record the aeronautical experience required for meeting the recent flight experience requirements of this part.

SECOND-IN-COMMAND LOG FLIGHT TIME (§ 61.51)

A pilot may log second-in-command time only for that flight time during which that person:

1) Is qualified according to the SIC requirements of 14 CFR §61.55 and occupies a crewmember station in an a/c that requires more than 1 pilot by the a/c’ type certificate; or

2) Holds the appropriate category, class and instrument rating (if an instrument rating is required for the flight) for the a/c being flown, and more than 1 pilot is required under the type certification of the a/c of the regulations under which the flight is being conducted.

CARRY PASSENGERS IN FORMATION FLIGHT / RESTRICTED, LIMITED OR EXPERIMENTAL CATEGORY AIRCRAFT (§ 91.111, 313, 315, 317, 319)

No person may operate an aircraft, carrying passengers for hire, in formation flight.
No person may operate a restricted, limited, or experimental category aircraft carrying persons or property for hire.

TYPE RATING, ADDITIONAL TRAINING, REQUIREMENTS (§ 61.31)

a. Type rating required

1) Large aircraft (more than 12,500 lbs)
2) Turbojet-powered airplanes
3) Other aircraft specified by the Administrator

b. Complex airplane (retractable landing gear, flaps, and controllable pitch propeller) / High-performance airplanes (an engine of more than 200 HP)

1) Received and logged ground and flight training from an authorized instructor in a complex / high-performance airplane or in a flight simulator of flight triaging device that representative of complex / high-performance airplane
       2) Received a one-time endorsement in the pilot’s logbook

c. Pressurized aircraft (service ceiling or max. operating altitude, which ever is lower, above 25,000 ft MSL)

1) Received and logged ground training from an authorized instructor and obtained an endorsement in the person’s logbook or training record
2) The ground training must include high-altitude aerodynamics, meteorology, respiration, hypoxia, and duration of consciousness w/o supplemental oxygen
3) The flight training must include normal cruise flight operations, proper emergency procedures for simulated rapid decompression, and emergency descent procedures.

REQUIRED DOCUMENTS ON BOARD AN AIRCRAFT (§ 91.9, 203)

Airworthiness Certificate
Registration Certificate
Radio Station License: if radio transmitter is to be operated outside the U.S
Operating Limitations: may take the form of an FAA-approved AFM/POH, placards, instrument markings, or any combination of the above.
Weight & Balance Data

DOCUMENT MUST BE DISPLAYED ON BOARD IN A/C (§ 91. 203)

Airworthiness Certificate or a special authorization issued is displayed at the cabin entrance of cockpit entrance so that it is legible to passengers and review.

AIRCRAFT LOGBOOK OR ENGINE LOGBOOK REQUIRED TO BE ON BOARD?

No. The regulations do not specifically state where the logbooks are to be kept, but specified that they should be made available upon request.

AIRWORTHINESS CERTIFICATE INDICATED NORMAL / UTITLITY CATEGORIES (§ 23)

a. Normal category: Load factor of 3.8 Gs w/o structural failure.
                   Non-aerobatic operation
b. Utility Category: Load factor of 4.4 Gs.
                   Permit limited aerobatics, including spins (if approved)

PLACARDS REQUIRED TO BE ON THE A/C (POH 2-23)

Refer to Arrow POH 2-29

AIRSPEED COLOR-CODED MARKING SYSTEM (8083-25 )

White Arc: flap operating range
Lower limit of white arc: Vs0 (stall speed clean or specified configurations)
Upper limit of white arc: VFE (max. flap extension speed)

Green Arc: normal operating range
       Lower limit of green arc: Vs1 (stall speed clean configuration)
       Upper limit of green arc: VNO (max structural cruise speed)

Yellow Arc: caution range (operation in smooth air only)

Red Arc: VNE (max. speed for operation in smooth air only)

WHAT IS EQUIPMENT LIST AND WHERE IS IF FOUND? (8083-1)

Furnished with the aircraft is an equipment list that specifies all the required equipment and all equipment approved for installation in the aircraft.
The weight and arm of each item is included on the list, and all equipment installed when the aircraft left the factory is checked.
It is usually found with weight & balance data.

REQUIRED MAINTENENCE INSPECTIONS FOR A/C (§ 91. 409)

a. Annual inspection: within the preceding 12 calendar months.
b. 100-hour inspection: if carrying any person (other than a crewmember) for hire or giving flight instruction for hire.

100 HR INSPECTION SUSTITUTE FOR AN ANNUAL INSPECTION? (§ 91. 409)

No. an annual inspection is acceptable as a 100-hour inspection, but the reverse is not acceptable.

SUBSTITUTION FOR 100 HOUR INSPECTION (§ 91. 409)

The following may replace a 100-hour inspection

a. A/C inspected in accordance with an approved a/c inspection program under Part 125 or 135

b. Progressive inspections which provide for the complete inspection of an a/c by specifying the intervals in hours and days when routine and detailed inspections will be performed during a 12-calendar month period.

PROGRESSIVE INSPECTIONS

Event: 60 hours / 4 events to 1 cycle
Cycle: 240 hours / 1 cycle every 12 calendar months

During an event inspection, maintenance will service and inspect pre-determined location inspections.
Each aircraft is divided into 4 major sections. During each event, one of these locations will be serviced / inspected in great detail.
After 4 events, or one complete cycle, the airplane will have been thoroughly inspected from prop to rudder.
It takes 4 events to complete one cycle. Each aircraft has to go through one cycle every 12 calendar months.

REQUIRED MAINTENANCE & EQUIPMENT INSPECTION

Annual inspection (12 calendar months)
VOR check within 30 days
100 hour inspection
Altimeter (24 calendar months)
Transponder certification (24 calendar months)
ELT inspection (12 calendar months) and ELT batteries must be replaced after 1cumulative hour of use or 50% of total life expires
Static system (24 calendar months)

PREVENTIVE MAINTENANCE (8083-25)

Preventive maintenance is considered to be simple or minor preservation operations and the replacement of small standard parts not involving complex assembly operations.
Certificated pilots, excluding student, sport and recreational pilots, may perform preventive maintenance on any aircraft that is owned or operated by them provided that aircraft is not used in air carrier service.
 14 CFR Part 43 identifies typical preventive maintenance operations which includes such basic items as oil changes, wheel bearing lubrication, hydraulic fluid (brakes, landing gear system) refills.

AIRWORTHINESS DIRECTIVES (8083-25: 8-12)

The unsafe condition may exist because of design defect, maintenance or other causes in the aircraft.
Used to notify aircraft owners and other interested persons of unsafe conditions and to prescribe the conditions under which the product may continue to be operated
Are regulatory and must be complied with and owner’s responsibility to assure compliance with all pertinent AD’s
Divided into 2 category
       1) Emergency nature requiring immediate compliance upon receipt
2) Less urgent nature requiring compliance within a relatively longer period of time

REQUIRED INSTRUMENTS FOR VFR DAY/NIGHT & IFR (§ 91. 205)

DAY
Airspeed Indicator
Tachometer
Oil pressure gauge
Manifold Pressure gauge
Altimeter
Temperature gauge
Oil temperature gauge
ELT
Fuel gauge
Landing gear position indicator
Anti-collision light
Magnetic compass
Emergency equipment
Seat belts, shoulder harness

NIGHT
Fuses
Landing light
Anti-collision lights
Position light
Source of electrical energy

IFR
Generator (alternator)
Radios and navigation Equipment
Altimeter with altimeter setting knob
Ball (slip and skid)
Clock with secondhand
Attitude indicator
Rate of turn (TC)
Directional gyro (HD)

MINIMUM EQUIPMENT LIST (AC 91-67)

MEL is the specific inoperative equipment documents for a particular make and model aircraft by serial and registration number
MEL permits operation of aircraft under specific condition with inoperative equipment.
The FAA considers MEL as a Supplemental Type Certificate.
When FAA adopted the MEL concept, this allowed operations with inoperative equipment determined to be nonessential for safe flight.

INOPERATIVE EQUIPMENT FOR LEGAL FLIGHT (§ 91. 213)

1. Is the equipment required by the aircraft’s equipment list or the kind of equipment list? (in the POH / AFM)

2. Is the equipment required by the VFR-day type certificate requirements prescribed in the airworthiness certification regulation ? (in Maintenance Logbook / FAA website)

3. Is the equipment required by AD?

4. Is the equipment required by FAR § 91. 205, 207 ?

Pilot’s final determination to conform that inoperative instrument / equipment does not effect hazard under the anticipated operational conditions before release departure.

SPECIAL FLIGHT PERMINT (8083-25: 8-12)

Special Airworthiness Certificate authorizing operation of an aircraft that does not currently meet applicable airworthiness requirements but is safe for a specific flight.
Before permit is issued, an FAA inspector may personally inspect a/c, or require it to be inspected by an FAA-certificated A&P mechanic or appropriately certificated repair stations to determine its safety for the intended flight.
Issued to allow the aircraft to be flown to a base where repairs, alterations, or maintenance can be performed; for delivering or exporting the aircraft; or for evacuating an aircraft from an area of impending danger.
May be obtained from the local FISO or Designated Airworthiness Representative.