# AD 56-16-04: Landing Gear Torque Knees

- Type: Airworthiness directive
- Status: Current
- Products: Swift Museum Foundation GC-1A and GC-1B
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 541 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CF4AF98A9241BD2386256A56006BB500.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/56-16-04

## The airworthiness directive

56-16-04 UNIVERSAL (Globe): Applies to Models GC-1A and GC-1B Aircraft.

To be accomplished as soon as possible but not later than September 15, 1956.

It has been reported that the landing gear was replaced with an E.L.I. type gear (air-oil) on a Globe Model GC-1B airplane with a serial number higher than 196. A subsequent failure of one of the aluminum alloy torque knees resulted in the loss of the left landing gear and damage to the airplane. It is probable that the Adel aluminum alloy knee was substituted for the regular P/N 64A40 forged steel knee. The Adel aluminum alloy knee is not a suitable replacement on the E.L.I. gear assembly, since it does not provide for the extension stop, P/N 64A31.

To preclude similar occurrences, all aircraft not equipped with Adel main landing gear struts must replace the aluminum alloy torque knees with forged steel knees.

1. On aircraft equipped with Adel struts, the Adel forged aluminum torque knee assembly is satisfactory and may be retained.

2. Forged steel knees, E.L.I. P/N 64A40 are suitable as replacements on all types of landing gear units.

This supersedes AD 46-33-01.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-766](https://openairdocs.org/tcds/A-766): Swift Museum Foundation Inc.; names 2 of 2 models: GC-1A, GC-1B

## 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: 541 (541 by airframe model, 0 by engine model)
- Makers: Globe 426, Temco 115

Models with the most aircraft:

- [Globe GC-1B](https://openairdocs.org/model/globe-gc-1b): 395 aircraft (airframe model)
- [Temco GC-1B](https://openairdocs.org/model/temco-gc-1b): 115 aircraft (airframe model)
- [Globe GC-1A](https://openairdocs.org/model/globe-gc-1a): 31 aircraft (airframe model)

All 3 models: https://openairdocs.org/ad/56-16-04/models.md
Every aircraft: https://openairdocs.org/ad/56-16-04/aircraft.md

Its text cites no advisory circulars or STCs.

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