# AD 48-12-03: Smoke Detector System

- Type: Airworthiness directive
- Status: Current
- Products: Lockheed 649-79 and 749-79
- Superseded by: Nothing supersedes this AD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/4D80F1FC17CD07738625696D0071A312.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/48-12-03

## The airworthiness directive

48-12-03 LOCKHEED: Applies to All 649 and 749 Series Aircraft As Specified by Civil Air Regulations Amendments 41-3, 42-2 and 61-2.

To be accomplished not later than the dates specified in the above amendments as revised by special Civil Air Regulations Serial Nos. 385, 390, 390A, 390B and any subsequent regulations affecting these compliance dates.

All air carrier aircraft must be modified in all necessary respects to comply with the aircraft fire prevention requirements outlined in CAR Amendments 41-3, 42-2, and 61-2. Compliance with those requirements may be completed as follows:

1. Revise the smoke detection system in accordance with LAC Service Bulletin 49/SB-401. Other rework shown to be equivalent to that covered by this Service Bulletin will also be acceptable. (Applies to Serial Nos. 2512 through 2515, 2519 through 2543, 2545 through 2550, 2552 through 2555, 2560, and 2561 only.)

2. Inspect all cabin interior fabrics and finishes to determine that any substitutes or replacements for the materials originally installed comply with the applicable sections of CAR 4b. Safety Regulation Release 259 outlines acceptable procedures for complying with these particular requirements.

## 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 2 of 6 models: 649-79, 749-79

## 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 749-79](https://openairdocs.org/model/lockheed-749-79): 1 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/48-12-03/models.md
Every aircraft: https://openairdocs.org/ad/48-12-03/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.