# AD 75-21-01: Landing Gear

- Type: Airworthiness directive
- Status: Current
- Products: Aermacchi F.260 and F.260B
- Effective: October 13, 1975
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-2378
- Registered aircraft: 11 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3F2F438D51514C2E86256A55006AE5F2.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/75-21-01

## The airworthiness directive

75-21-01 SIAI-MARCHETTI: Amendment 39-2378. Applies to Models F.260 and 260B airplanes, Serial Numbers 101 thru 125, 2-26 thru 2-56, 3-76, 3-77, 3-80, and 502, except Serial Numbers 112, 2-33, 2-37, 2-43, 2-47, 2-53, and 2-54, certificated in all categories.

Compliance is required within the next 10 hours' time in service after the effective date of this AD, unless already accomplished.

To prevent failure of the landing gear actuator relay and subsequent inability to extend the landing gear by normal electrical means, replace the landing gear actuator relay, P/N 3311- 2(10A), with new relay, P/N MS 24166-D1(50A), and add a circuit breaker, P/N MS 3320-10, in accordance with the accomplishment instructions of SIAI-Marchetti Service Bulletin, S.B. No. 260B5B, dated December 22, 1973, or an FAA-approved equivalent.

This amendment becomes effective October 13, 1975.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A10EU](https://openairdocs.org/tcds/A10EU): Aermacchi S.p.A.; names 2 of 6 models: F.260B, F.260

## 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: 11 (11 by airframe model, 0 by engine model)
- Makers: Siai-Marchetti 11

Models with the most aircraft:

- [Siai-Marchetti F.260](https://openairdocs.org/model/siai-marchetti-f-260): 7 aircraft (airframe model)
- [Siai-Marchetti F.260B](https://openairdocs.org/model/siai-marchetti-f-260b): 4 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/75-21-01/models.md
Every aircraft: https://openairdocs.org/ad/75-21-01/aircraft.md

Its text cites no advisory circulars or STCs.

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