# AD 66-16-04: Flap Asymmetry Switches

- Type: Airworthiness directive
- Status: Current
- Products: Maryland Air Industries F-27, F-27A, F-27B, F-27F, F-27G and F-27J
- Effective: July 30, 1966
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-252
- Registered aircraft: 1 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5EB169C59BA91D7986256984007248DD.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/66-16-04

## The airworthiness directive

66-16-04 FAIRCHILD: Amdt. 39-252 Part 39 Federal Register June 30, 1966. Applies to Models F-27, F-27A, F-27B, F-27F, F-27G, and F-27J Airplanes, Serial Numbers 1 through 122, Equipped with Center Hinge Wing Flap Asymmetry Switches, P/N 658-001.

Compliance required within the next 300 hours' time in service after the effective date of this AD unless already accomplished.

To prevent failure of the flap asymmetry switch to continuously detect an asymmetric condition as the asymmetry increases above the 3 degree setting, accomplish the following:

  (a) Rewire asymmetry system in accordance with Fairchild-Hiller Service Bulletin No. 27-43, dated December 23, 1965, or later FAA-approved revision, or an equivalent approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region.

  (b) Upon request of the operator, an FAA maintenance inspector, subject to prior approval of the Chief, Engineering and Manufacturing Branch, FAA Eastern Region, may adjust the compliance time specified in this AD if the request contains substantiating data to justify the increase for that operator.

This directive effective July 30, 1966.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 7A1](https://openairdocs.org/tcds/7A1): Maryland Air Industries Inc.; names 6 of 12 models: F-27, F-27A, F-27J, F-27F, F-27B, F-27G

## 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: 1 (1 by airframe model, 0 by engine model)
- Makers: Fairchild 1

Models with the most aircraft:

- [Fairchild F-27F](https://openairdocs.org/model/fairchild-f-27f): 1 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/66-16-04/models.md
Every aircraft: https://openairdocs.org/ad/66-16-04/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.