# AD 64-02-01: Main Landing Gear

- Type: Airworthiness directive
- Status: Current
- Products: Twin Commander 500-A, 500-B, 560-F, 680-FL and 680-F(P)
- Effective: February 20, 1964
- Published: January 21, 1964
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 140 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/736F4F9092BBCB5486256A38005C8278.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/64-02-01

## The airworthiness directive

64-02-01 AERO COMMANDER: Amdt. 676 Part 507 Federal Register January 21, 1964. Applies to Models 500A, 500B, 560F, 680F (Pressurized) and 680FL Aircraft Serial Numbers 871, 875, and 893 through 1329 Except Serial Numbers 916, 953, 1162, 1186, 1207, 1224, 1234, 1293, 1303, 1325, 1327, and 1328.

Compliance required as indicated.

To detect loosened set screws and to preclude rotation of the upper retaining bearing on the main landing gear accomplish the following:

  (a) Within 25 hours' time in service after the effective date of this AD, inspect the main landing gear in accordance with Part I of Aero Commander Service Bulletin No. 83 dated September 13, 1963, or FAA approved equivalent. If the extension of either gear exceeds 9.125 plus or minus 0.125 inches, accomplish the modification specified in (b) for both main landing gears before further flight.

  (b) Within 50 hours' time in service after the effective date of this AD, modify the landing gear in accordancewith Part II of Aero Commander Service Bulletin No. 83 dated September 13, 1963, or FAA approved equivalent. Stamp the letter "A" after the design number on each landing gear data plate after the modification is made.

This directive effective February 20, 1964.

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 2A4](https://openairdocs.org/tcds/2A4): Twin Commander Aircraft LLC; names 3 of 21 models: 680-F, 560-F, 680-FL
- [TCDS 6A1](https://openairdocs.org/tcds/6A1): Twin Commander Aircraft LLC; names 2 of 9 models: 500A, 500B

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 140 (140 by airframe model, 0 by engine model)
- Makers: Aero Commander 140

Models with the most aircraft:

- [Aero Commander 500-B](https://openairdocs.org/model/aero-commander-500-b): 85 aircraft (airframe model)
- [Aero Commander 500-A](https://openairdocs.org/model/aero-commander-500-a): 23 aircraft (airframe model)
- [Aero Commander 680-F](https://openairdocs.org/model/aero-commander-680-f): 11 aircraft (airframe model)
- [Aero Commander 680FL](https://openairdocs.org/model/aero-commander-680fl): 10 aircraft (airframe model)
- [Aero Commander 560-F](https://openairdocs.org/model/aero-commander-560-f): 6 aircraft (airframe model)
- [Aero Commander 680FL P](https://openairdocs.org/model/aero-commander-680fl-p): 5 aircraft (airframe model)

All 6 models: https://openairdocs.org/ad/64-02-01/models.md
Every aircraft: https://openairdocs.org/ad/64-02-01/aircraft.md

Its text cites no advisory circulars or STCs.

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