# AD 59-20-02: Fuel Use Placard and Flame Arrestors

- Type: Airworthiness directive
- Status: Current
- Products: Lockheed Martin Aeronautics 1649A-98
- Superseded by: Nothing supersedes this AD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/CF45ED06E8C70F0B8625696F0047EFD9.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/59-20-02

## The airworthiness directive

59-20-02 LOCKHEED: Applies to All Model 1649A Aircraft.

Compliance required on items (1) and (2) by October 15, 1959; compliance required on item (3) by December 1, 1959.

As a result of a recent accident involving a suspected explosion of a wing tank, the following shall be accomplished to prevent the possible recurrence of such an explosion:

  (1) Remove the static wick on the inboard wings adjacent to the tank vents.

  (2) Install temporary placard at engineer's station reading as follows: "In order to maintain a nonexplosive rich mixture in tanks, do not use fuel out of auxiliary tanks Nos. 5, 6, and 7 below 50 gallons. In operations which involve use of fuel from main tanks only, the 50 gallons of residual fuel in the auxiliary tanks must be replaced with 50 gallons of fresh fuel or mixed with at least 150 gallons of fresh fuel at the end of every 12 flight-hours or 5 flights, whichever occurs first."

  (3) Install P/N 634014-1 or equivalent flame arrestors in the tank vent outlets.

After installation of flame arrestors described in item (3), item (2) may be disregarded.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 4A17](https://openairdocs.org/tcds/4A17): Lockheed Martin Aeronautics Company; names 1 of 1 models: 1649A-98

## 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 1649A-98](https://openairdocs.org/model/lockheed-1649a-98): 1 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/59-20-02/models.md
Every aircraft: https://openairdocs.org/ad/59-20-02/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.