# AD 59-08-01: Landing Gear Limit Switches

- Type: Airworthiness directive
- Status: Current
- Products: Textron A35, B35 and C35
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 565 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A3A07104374D3FF086256A1C0072DAD5.0001
- DRS record last changed: January 21, 2026
- Page: https://openairdocs.org/ad/59-08-01

## The airworthiness directive

59-08-01 BEECH: Applies to Models A35, B35, C35, Serial Numbers D-1501 Through D-2800.

Compliance required prior to July 1, 1959.

Several cases of landing gear actuation failure have been attributed to malfunctioning of the landing gear limit switches due to oil accumulation in the switch. Inspect the switches in the gear box area and if they are located under the gear box they must be:

  (1) Cleaned and sealed at the switch case parting surfaces with polyethylene, vinyl or rubber cement and reinstalled in the same location; (use minimum cement to assure that none gets inside switch) or

  (2) Replaced with new switches installed in a location to preclude oil contamination. Beechcraft Service Bulletin 35-21, A35-14, B35-7, and C35-5, dated June 1, 1953, and Supplement dated August 15, 1953, provide an acceptable procedure for relocation of the switches.

## 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 3 of 9 models: A35, B35, C35

## 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: 565 (565 by airframe model, 0 by engine model)
- Makers: Beech 565

Models with the most aircraft:

- [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 3 models: https://openairdocs.org/ad/59-08-01/models.md
Every aircraft: https://openairdocs.org/ad/59-08-01/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.