FAR 43 Appendix

The ATC transponder test that is required by 91.413 may be conducted using a bench test or portable test equipment

If portable equipment is used operate the test equipment for ATCRBS (air traffic control radar beacon) at a nominal rate of 235 interrogations per second

For Mode S transponders operate the equipment at 50 mode S interrogations per second

An additional 3db loss is allowed to compensate for antenna coupling errors during receiver sensitivity measurements when using portable test equipment

Check the Reply Frequency:

Different frequencies for different classifications of transponders

Suppression: different classes are set at different interrogation rates

Verify that the transponder isn't responding to more than 1 % of ATCRBS interrogations when the amplitude of P2 pulse is equal to P1 pulse

Verify that the transponder replies to at least 90% of ATCRBS interrogations when the amplitude of P2 is 9db less than the P1 pulse

Receiver sensitivity: Verify that for any class of ATCRBS transponder, the receiver minimum triggering level (MTL) of the system is -73 +/- 4 dbm. Mode S= -74 +/- 3dbm

Verify that the difference in mode 3/A and mode C receiver sensitivity does not exceed 1db for any class of ATCRBS or Mode S transponder

Radio Frequency (RF) Peak Output Power: Verify that the transponder output power is within the specification for that class of transponder

Mode S Diversity Transmission Channel Isolation: Verify that the RF peak output power transmitted from the selected antenna exceeds the power of the other antenna by at least 20 db

Mode S Address: Interrogate the mode S transponder and verify that it only replies to its assigned address.

Mode S Formats: Interrogate the mode S transponder with uplink formats (UF) for which it is equipped and verify that its replies are made in the correct format.

Mode S All Call Interrogations: Interrogate the Mode S transponder with Mode S only all call format to verify the correct address and capability are reported in the replies

ATRBS-Only All-Call Interrogation: Interrogate the Mode S transponder with the ATRBS-only all call interrogation and verify that no reply is generated

Squitter Test: Verify that the Mode S transponder generates a correct squitter

Records: Comply with 43.9 as to content, form, and disposition

FAR 43 Appendix

Appendix A

Appendix D

Major Alterations

Annuals & 100 Hours

Engine and Nacelle

Cabin and Cockpit

Fuselage and Hull Group

Propeller Alterations

Airframe Alterations

Appendix B: Recordings of major repairs and major alterations

People performing an annual or a 100-hour must open all inspection plates, access doors, fairing, and cowlings, and wash the airplane and engine

• Signed copy of 337 form to the owner
• Send one copy of 337 form to the FAA Aircraft Registrations Branch in Oklahoma city, Oklahoma within 48 hours of approved return to service

Inspect...

• Fabric and skin: Deterioration, distortion other evidence of failure and defective/insecure fittings
• Systems and Components: Improper installation, defects, and unsatisfactory ops.
• Envelope, gas bags ballast tanks, and related parts: Poor conditions

Inspect for...

• Uncleanliness and loose equipments
• Seats and seat belts: Poor condition and apparent defects
• Windows & windshields: Deterioration and breakage
• Instruments: Poor condition, mounting, marking, and improper operation
• Flight & Engine controls: Improper installation and improper ops.
• Batteries: Improper installation and improper charge
• All Systems: Improper Installation, poor general condition, apparent and obvious defects, and insecurity of attachment

Inspect for...

• Engine Section: Visual evidence of excessive oil, hydraulic leaks, and sources of leaks
• Studs & Nuts: Improper torquing and defects
• Internal Engine: Cylinder compression, and for metal particles on screens and sump drain plugs
• Engine Mount: Cracks, looseness of mounting, and looseness of mount
• Flexible Vibration Dampeners: Poor condition, and deterioration
• Engine controls: Defects, improper travel, and safetying
• Lines, Hoses, & Clamps: Leaks, improper condition and looseness
• Exhaust stacks: Cracks, defects, and improper attachment
• Accessories: Defects in security of mounting
• All Systems: Improper installation, poor general condition, defects and insecure attachments

• Wings
• Tail Surfaces
• Fuselage
• Engine Mounts
• Control System
• Landing Gear
• Hull or Floats
• Rotor Blades

• Changes in blade design
• Changes in hub design
• Changes in the governor or control design
• Installation of a propeller governor or feathering system
• Installation of propeller de-icing system
• Installation of parts not approved for the propeller

Appliance Major Repairs

For extended- range fuel tanks installed withing the passenger compartment or a baggage compartment

Need Triplicate 337 form

• one placed in the aircraft
• One given to the owner
• One send to the FAA, Oklahoma

• Calibration and repair of instruments
• Calibration of radio equipment
• Rewinding the field coil of an electrical accessory
• Complete disassembly of complex hydraulic power valves
• Overhaul of pressure type carburetors, and pressure fuel, oil, and hydraulic pumps.

Major Repairs

• Airframe parts including spars, ribs, fittings, shock absorbers, bracing, cowling, fairings, and balance weights
• Changes to the basic design of the fuel, oil, cooling, heating, cabin pressurization, electrical, hydraulic, de-icing, and exhaust
• Changes to the wing, or to fixed or movable control surfaces

Airframe Major Repairs

Repairs involving the strengthening, reinforcing, splicing, and manufacturing of primary structural members or their replacement, when replacement is by fabrication such as riveting or welding are airframe major repairs.

Propeller major repairs

• Box beams
• Monocoque or semimonocoque wings or control surfaces
• Wing Stringers or chord members
• Spars
• Spar flanges
• Members of truss type beams
• Thin Sheet webs of beams
• Keel and chine members of boat hulls or floats
• Corrugated sheet compression members which act as flange material of wings or tail surfaces
• Wing main ribs and compression members which act as flange material of wings or tail surfaces
• Wing or tail surface brace struts

Power plant major repairs

• Any repairs to, or straightening of steel blades
• Repairing or machining of steel hubs
• Shortening of blades
• Retipping of wood propellers
• Replacement of outer laminations on fixed pitch wood propellers
• Repairing elongated bolt holes in the hub of fixed pitch wood propellers
• Inlay work on wood propellers
• Repairs to composition blades
• Replacement of tip fabric
• Replacement of plastic covering
• Repair of propeller governors
• Overhaul of controllable pitch propellers
• Repairs to deep dents, cuts, scars, nicks etc and straightening of aluminum blades
• The repair or replacement of internal elements of blades

• Separation or disassembly of a crankcase or crankshaft of a reciprocating engine equipped with an : (1) integral supercharger OR (2)non spur-type propeller reduction gearing
• Special repairs to structural engine parts by welding, plating, metalizing or other methods

• Engine mounts
• Fuselage longerons
• Members of the side truss, horizontal truss or bulkheads
• Main seat support braces and brackets
• Landing gear brace struts
• Axles
• Wheels
• Skis and Ski pedestals
• Parts of the control system such as control columns, pedals, shafts, brackets or horns
• Repairs involving substitution of material
• The repair of damaged areas in metal or plywood stressed covering exceeding six inches in any direction
• The repair of portions of skin sheets by making additional seams
• The splicing of skin sheets

• The repair of three or more adjacent wing or control surfaces ribs or the leading edge of wings and control surfaces between such adjacent ribs
• Repair of fabric covering involving an area greater than that required to repair two adjacent ribs
• Replacement of fabric on fabric covered parts such as wings, fuselages, stabilizers, and control surfaces
• Repairing, including rebottoming of removable or integral fuel tanks and oil tanks.

Landing Gear

Inspect for...

• All units: Poor condition, and insecurity of attachment
• Shock absorbing devices: Improper oleo fluid level
• Linkages, Trusses, and Members: Undue, or excessive wear fatigue, and distortion
• Retracting & Locking Mechanisms: Improper operations

• Hydraulic Lines: Leakage
• Electrical System: Chafing, and Improper Operation of switches
• Wheels: Cracks, defects, and condition of bearings
• Tires: Wear and cuts
• Brakes: Improper adjustments
• Floats & Skis: For insecure attachment and obvious or apparent defects

Appendix E: Altimeter System Test and Inspection

Powerplant Alteration

Inspection done to comply with Part 91.411

Tip

Rule: No person may operate an airplane, or helicopter, in controlled airspace under IFR unless within the preceding 24 calendar months, each static pressure system, each altimeter instrument and each automatic pressure altitude reporting has been tested and inspected and found to comply with appendices E and F of part 43.

Wings, Empennage, & Others

A certified mechanic with an airframe rating can only do static pressure system tests and inspection

If you have any miscellaneous item

not covered in this listing, check for improper installation and improper operation

Altimeter test can be done only by an appropriately rated repair facility.

Inspect wings and empennage assembly for...

• Poor general condition
• Fabric or skin deterioration
• Distortion
• Evidence of failure
• Insecure attachment

Only for Empennage

• Improper component installation and operation

• Changes from one approved model of engine to another.
• Changes to an engine by replacing structural parts with parts not supplied by the manufacturer
• Installation of an accessory not approved for the engine
• Removal of accessories
• Installation of unapproved structural parts
• Conversions of any sort for the purpose of using fuel of a rating or grade other than listed in the engine specifications

Static Pressure System

• Ensure freedom from entrapped moisture and restrictions
• Determine that the static port heater, if installed is operative
• Ensure that no alterations or deformations of the airframe surface have been made that would affect the relationship between air pressure in the static pressure system and true ambient static air pressure for any flight conditions.
• Determine that leakage is within the tolerances established in 23.1325 or 25.1325 whichever is applicable

Inspect for...

• Propeller Assembly: Cracks, nicks, binds, and oil leaks
• Bolts: Improper torquing and lack of safetying
• Anti-Icing devices: Improper ops and obvious defects
• Control Mechanisms: Improper operation, insecure mounting, and restricted travel

Inspect for...

• Radio & Electronic Equipments: Improper installation and insecure mounting
• Wiring & Conduits: Improper Routing, insecure mounting and obvious defects
• Bonding & Shielding: Improper installation and poor condition
• Antenna (Includes trailing antenna): Improper mounting, poor condition, and improper ops.

Propeller & Radio

23.1325

Pressurized airplanes: Evacuate the static pressure system until a pressure differential equivalent to the maximum cabin pressure differential for which the airplane is type certificated is achieved. Without additional pumping for a period of 1 minute, the loss of indicated altitude must not exceed 2 percent of the equivalent altitude of the maximum cabin differential pressure or 100 feet, whichever is greater.

Unpressurized airplane: Evacuate the static pressure system to a pressure differential of approximately 1 inch of mercury or to a reading on the altimeter, 1000 feet above the aircraft elevation at the time of test. Without additional pumping for a period of 1 minute, the loss of indicated altitude must not exceed 100 feet on the altimeter

Altimeter test

Test done are the following

Scale error

Hysteresis

After Effect

Friction

Case leak

Barometric scale error

Includes

• lubrication not requiring disassembly
• Making simple fabric patches (no rib stitches or removal of structural parts)
• filling hydraulic reservoir
• Refinishing of decorative coatings (excluding balanced control surfaces)
• applying preservative or protective material
• Repair of upholstery and decorative furnishings
• small simple repairs to fairings, nonstructural cover plates...

• Removal, installation, and repair of landing gear tires
• Replacing elastic shock absorber cords on landing gear
• Servicing landing gear struts
• Servicing wheel bearings
• Replacing defective safety wire or cotter pins

• Replacing side windows where work does not interfere with the structure or any operating systems
• replacing safety belts
• replacing seats or seat parts with replacement parts
• Troubleshooting and repair of landing light wiring circuits
• Replacing bulbs, reflectors, and lenses of position and landing lights
• Replacing wheels and skis where no weight and balance computation is involved
• Replacing any cowling not requiring removal of prop or disconnection of flight controls.
• Replacement, cleaning, and setting of gap on spark plug

Appendix F

Preventative Maintenance

The inspection and maintenance tasks prescribed and identified as preventative maintenance in a primary category aircraft type certificate or STC holder's inspection program

• at least a private pilot certificate under 61 who is a registered owner of the affected aircraft
• holding a certificate of competency issued by a school (147.21 (e) ) or issued by by the holder of the production certificate of affected aircraft
• The inspections and maintenance tasks are performed in accordance with instructions contained by the special inspection and preventative maintenance program

• Replacing any hose connections except hydraulic
• replacement of prefabricated fuel lines
• cleaning or replacement fuel and oil strainers or filter elements
• replacing and servicing batteries
• cleaning of balloon burner pilot and main nozzles

ATC Transponder Tests/ Inspections

• Updating self-contained, front instrument panel-mounted ATC navigational software data bases
• Excluding automatic flight control systems, transponders, and DME equipment

• Provided no disassembly of the unit is required, and pertinent instructions are provided

• Operational check is required in accordance to part 91

• Replacement or adjustment of nonstructural standard fasteners
• The interchange of balloon basket and burners when designed as interchangeable and quick removal and installation
• Installation of anti-misfueling devices to reduce the diameter of fuel tank filler openings (type certificate, FAA approved instructions)
• Removal, checking, replacement of magnetic chip detector
• Removal and replacement of self-contained, front instrument panel-mounted navigation and communication devices

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