# AD 69-18-01: Fuel System Modification

- Type: Airworthiness directive
- Status: Current
- Products: Textron 35, A35, B35 and C35
- Effective: August 30, 1969
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-830
- Registered aircraft: 831 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/996D66E87BC1061386256A080073217E.0001
- DRS record last changed: January 21, 2026
- Page: https://openairdocs.org/ad/69-18-01

## The airworthiness directive

69-18-01 BEECH: Amdt. 39-830. Applies to all Model 35, A35, B35 and C35 (Serial Numbers D-1 through D-2900) airplanes equipped with Beech P/N 35-924065 fuel unit.

Compliance: Required as indicated.

Within the next 100 hours' time-in-service, but not to exceed August 30, 1970, unless already accomplished, accomplish either A or B:

A) Replace Beech P/N 35-924065 fuel unit with Beech P/N 35-924230 fuel unit having separate selector valve and pump controls or with any other modification of this portion of the fuel system approved by Chief, Engineering & Manufacturing Branch, Central Region, FAA.

B) Install Beech fuel selector valve disengagement warning light, Kit No. 35-5030, in accordance with Beech Service Instructions No. 0243-289, or any other modification of this portion of the fuel system approved by the Chief, Engineering & Manufacturing Branch, Central Region, FAA.

This AD supersedes AD 53-20-02.

This amendment becomes effective August 30, 1969.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-777](https://openairdocs.org/tcds/A-777): Textron Aviation Inc.; names 4 of 9 models: A35, B35, C35, 35

## 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: 831 (831 by airframe model, 0 by engine model)
- Makers: Beech 831

Models with the most aircraft:

- [Beech 35](https://openairdocs.org/model/beech-35): 266 aircraft (airframe model)
- [Beech C35](https://openairdocs.org/model/beech-c35): 258 aircraft (airframe model)
- [Beech A35](https://openairdocs.org/model/beech-a35): 159 aircraft (airframe model)
- [Beech B35](https://openairdocs.org/model/beech-b35): 148 aircraft (airframe model)

All 4 models: https://openairdocs.org/ad/69-18-01/models.md
Every aircraft: https://openairdocs.org/ad/69-18-01/aircraft.md

Its text cites no advisory circulars or STCs.

## NTSB investigations that cite this AD (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB DCA22FA157](https://openairdocs.org/ntsb/DCA22FA157), Jul 23, 2022: Beech A35 (N8466A), Centralia, IL, substantial damage, 1 fatal. Probable cause: The pilot’s unsuccessful attempt to switch fuel tanks, which resulted in fuel starvation. Contributing to the accident was the uninstalled fuel selector handle warning device.

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