# AD 47-43-10: Fire Extinguisher Bottle Rework

- 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- Superseded by: Nothing supersedes this AD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/223CD9A20958A5598625696D00459177.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/47-43-10

## The airworthiness directive

47-43-10 LOCKHEED: (Was Mandatory Note 21 of AD-723-3.) Applies to All Model 18 Serial Numbers.

Compliance required prior to February 1, 1948.

Inspect all Alfite Model 2CD1722 operating heads for the CO2 bottles (fire extinguishing system) and nitrogen bottles (emergency landing gear extension system) to determine whether these heads have been stamped with the letter "L" adjacent to the swivelnut. If the head is not marked in this manner, disassemble the head and examine the cable sheave for part number. All 2CD2248 sheaves should be reworked by rounding the inner shoulder of the ramp at its lower end throughout a distance of 1 1/4 inches, to eliminate possible jamming of the mechanism. When reworked sheaves are installed, the operating heads should be identified by the letter "R" stamped adjacent to the swivelnut.

(Lockheed Service Bulletin 18/SB-140 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/47-43-10/models.md
Every aircraft: https://openairdocs.org/ad/47-43-10/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.