# AD 79-05-04: Auxiliary Fuel Tanks

- Type: Airworthiness directive
- Status: Current
- Products: Boeing 747-200B Series, 747-200C Series and 747-200F Series
- Effective: March 15, 1979
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-3431
- Registered aircraft: 5 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8CE9D226A6929338862568390063D677.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/79-05-04

## The airworthiness directive

79-05-04 BOEING: Amendment 39-3431. Applies to Boeing 747-200 series airplanes, Serial Numbers 20237, 20238, 20239, 20556, 20557, 21054, 21140, 21189, 21190, and 21237, equipped with auxiliary fuel tanks Number 1 and Number 4. Unless modified in accordance with Boeing Service Bulletin 747-28-2067 dated November 11, 1977, or Boeing Alert Service Bulletin 747-28-A2091, Revision 1, dated February 5, 1979, or later FAA approved revisions, accomplish the following: A. Discontinue immediately the use of auxiliary fuel tanks Number 1 and Number 4; B. Drain fuel from those tanks; and C. Open and collar the associated tank pump circuit breakers. Equivalent inspections and repairs may be used when approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington 98108. Compliance with the revised alert bulletin requirements is considered satisfactory terminating action for this Airworthiness Directive. Themanufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer, may obtain copies upon request to Boeing Commercial Airplane Company, P.O. Box 3707, Seattle, Washington 98124. These documents may also be examined at FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington 98108.

This amendment becomes effective March 15, 1979, and was effective earlier for all recipients of the telegram dated December 22, 1978.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A20WE](https://openairdocs.org/tcds/A20WE): The Boeing Company; names 3 of 14 models: 747-200B Series, 747-200F Series, 747-200C Series

## 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: Boeing 5

Models with the most aircraft:

- [Boeing 747-251F](https://openairdocs.org/model/boeing-747-251f): 2 aircraft (airframe model)
- [Boeing 747-257B](https://openairdocs.org/model/boeing-747-257b): 1 aircraft (airframe model)
- [Boeing 747-283B](https://openairdocs.org/model/boeing-747-283b): 1 aircraft (airframe model)
- [Boeing 747-273C](https://openairdocs.org/model/boeing-747-273c): 1 aircraft (airframe model)

All 4 models: https://openairdocs.org/ad/79-05-04/models.md
Every aircraft: https://openairdocs.org/ad/79-05-04/aircraft.md

Its text cites no advisory circulars or STCs.

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