# AD 55-26-01: Fuselage Fuel Tank Modification

- Type: Airworthiness directive
- Status: Current
- Products: P. V. Shields A-26B (Army) and A-26C (Army)
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Registered aircraft: 19 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/74C9BC714448B39E862569BC00658428.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/55-26-01

## The airworthiness directive

55-26-01 DOUGLAS: Applies to A-26 Aircraft Having Rear Fuselage Fuel Tank Installation.

To be accomplished prior to actuation of fuselage fuel tank.

Because of an explosion in the air and loss of aircraft, instructions were issued October 12, 1955, to deactivate the rear fuselage fuel tank on the above aircraft until further notice.

If the following modification, or its equivalent, is accomplished this fuel tank may be reactivated:

1. Provide fume tight closure and sealing of bulkheads at Stations 332 and 369. This should include tight fitting grommets or fairleads around control cables, or other members passing through bulkhead.

2. Remove all electrical equipment and oxygen tanks, if installed, from the tank compartment. Relocate elsewhere in the airplane as required.

3. Provide insulation around any electrical terminals in tank bay.

4. Provide adequate ventilation airscoop on top or side of tank compartment and exit vent on bottom. Provide drain holes in bottom of compartment to assure complete fuel drainage.

5. Ascertain that fuel tank, filler, cap, scupper, drain, and attaching lines and fittings are airworthy.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS TCS L-3](https://openairdocs.org/tcds/TCS%20L-3): P. V. Shields; names 2 of 2 models: A-26B (Army), A-26C (Army)

## 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: 19 (19 by airframe model, 0 by engine model)
- Makers: Douglas 19

Models with the most aircraft:

- [Douglas A-26B](https://openairdocs.org/model/douglas-a-26b): 11 aircraft (airframe model)
- [Douglas A-26C](https://openairdocs.org/model/douglas-a-26c): 8 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/55-26-01/models.md
Every aircraft: https://openairdocs.org/ad/55-26-01/aircraft.md

Its text cites no advisory circulars or STCs.

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