# AD 46-13-01: Landing Gear Hose Ferrules

- Type: Airworthiness directive
- Status: Current
- Products: Lockheed 18
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Registered aircraft: 2 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/46347AB1D4CBF25F8625696D0045897B.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/46-13-01

## The airworthiness directive

46-13-01 LOCKHEED: (Was Service Note 2 of AD-723-2.) Applies to All Model 18 Aircraft. When replacing the landing gear actuating cylinder flexible hose, P/N 55252-3, the length of ferrules should be compared. If longer ferrules are found on the new hoses, an elbow should be inserted between the hose and the cylinder aft port, to prevent possible damage to the hose by the landing gear scissors. (Lockheed Service Letter No. 18-28, dated June 15, 1945, revised December 10, 1945, covers this same subject.)

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-723](https://openairdocs.org/tcds/A-723): Lockheed Martin Aeronautics Company; names 1 of 1 models: 18

## 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: 2 (2 by airframe model, 0 by engine model)
- Makers: Lockheed 2

Models with the most aircraft:

- [Lockheed 18](https://openairdocs.org/model/lockheed-18): 2 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/46-13-01/models.md
Every aircraft: https://openairdocs.org/ad/46-13-01/aircraft.md

Its text cites no advisory circulars or STCs.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.