# AD 47-10-13: Fire Resistant Firewall Fittings

- Type: Airworthiness directive
- Status: Current
- Products: Lockheed 49-46
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Registered aircraft: 1 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A5EBFD391F7B0C78862569AD006F9118.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/47-10-13

## The airworthiness directive

47-10-13 LOCKHEED: (Was Mandatory Note 15 AD-763-3.) Applies to All Model 49 Serials Up to and Including 2075.

Compliance required prior to July 1, 1947.

  (a) On all firewalls, replace aluminum alloy bulkhead fittings for fuel, oil, and hydraulic lines with nickel steel fittings or others of equivalent fire resistance.

(LAC Service Bulletin 49/SB-108 covers this same subject.)

  (b) In nacelle zones 1 and 2 replace all buting having cut-length hose connections with flexible coupled hose assemblies.

(LAC Service Bulletin 49/SB-103 covers this same subject.)

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-763](https://openairdocs.org/tcds/A-763): Lockheed Martin Aeronautics Company; names 1 of 6 models: 49-46

## 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: 1 (1 by airframe model, 0 by engine model)
- Makers: Lockheed 1

Models with the most aircraft:

- [Lockheed 49-46](https://openairdocs.org/model/lockheed-49-46): 1 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/47-10-13/models.md
Every aircraft: https://openairdocs.org/ad/47-10-13/aircraft.md

Its text cites no advisory circulars or STCs.

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