# AD 47-34-03: Fuel Cell Seal

- Type: Airworthiness directive
- Status: Current
- Products: Textron D18C and D18S
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 55 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D1A94E98AA52667086256A1C0072EA85.0001
- DRS record last changed: January 21, 2026
- Page: https://openairdocs.org/ad/47-34-03

## The airworthiness directive

47-34-03 BEECH: (Was Service Note 2 of AD-765-1.) Applies to D18S and D18C Airplanes Having 80-Gallon Nose Fuel Tanks. Inspection required each 100 hours of operation.

Inspect the pinked tape applied with EC 870 cement to the sheet metal fuel cell enclosure for general condition and attachment to the fuel cell enclosure. Effect repairs, if necessary, to maintain the cell enclosure fume and fuel tight.

For 80-gallon nose fuel tanks having an inside filler neck, inspect the filler cap assembly for security of the chain and its attachment to the filler cap and anchor bar. If necessary, repairs should be accomplished to maintain the fuel cap assembly in good condition.

(Beech Service Bulletin No. D18-49 covers this same subject.)

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-765](https://openairdocs.org/tcds/A-765): Textron Aviation Inc.; names 2 of 17 models: D18S, D18C

## 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: 55 (55 by airframe model, 0 by engine model)
- Makers: Beech 55

Models with the most aircraft:

- [Beech D18S](https://openairdocs.org/model/beech-d18s): 55 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/47-34-03/models.md
Every aircraft: https://openairdocs.org/ad/47-34-03/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.