# AD 55-16-02: Fire Resistant Prop. Feathering Lines

- Type: Airworthiness directive
- Status: Current
- Products: Martin-Marietta 202, 202A and 404
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Registered aircraft: 5 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2005EA617F1FB92386256A32005910E9.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/55-16-02

## The airworthiness directive

55-16-02 MARTIN: Applies to Models 202, 202A, and 404 Aircraft Equipped With Hamilton Standard Propellers.

Compliance required by first scheduled engine change after November 1, 1955, but not later than November 1, 1956.

To increase the fire-resistance integrity of the propeller feathering system against damage by a powerplant fire, all flexible hose components of propeller feathering lines forward of the firewall must be replaced with lines and fittings which will meet current fire-resistant requirements. The following hose assemblies are considered acceptable for this application:

  (a) Aeroquip 680-12S hose assemblies with Aeroquip 304 protective sleeves over end fittings (Aeroquip assembly P/N 304000-12S).

  (b) Resistoflex SSFR-3800-10 hose assemblies utilizing -12 connections.

  (c) Aeroquip 309009-12S hose assemblies.

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-795](https://openairdocs.org/tcds/A-795): Martin-Marietta Corporation; names 2 of 2 models: 202A, 202
- [TCDS 1A7](https://openairdocs.org/tcds/1A7): Martin-Marietta Corporation; names 1 of 1 models: 404

## 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: 5 (5 by airframe model, 0 by engine model)
- Makers: Martin 5

Models with the most aircraft:

- [Martin 404](https://openairdocs.org/model/martin-404): 5 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/55-16-02/models.md
Every aircraft: https://openairdocs.org/ad/55-16-02/aircraft.md

Its text cites no advisory circulars or STCs.

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