- Model
- 1649A-98
- Data sheet
- TCDS4A17
- Registered aircraft
- 1 matched by model
- Product
- Aircraft · Large airplane
Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
| File | Size | SHA-256 | Original |
|---|---|---|---|
| FAA DRS HTML | 20 KB | 111444ba…7e173a7 | FAA DRS (API key needed) |
On this page
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 TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 1
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.