# AD 73-20-01: Front and Rear Spar Fittings

- Type: Airworthiness directive
- Status: Current
- Products: Maryland Air Industries F-27, F-27A, F-27B, F-27F, F-27G, F-27J, F-27M, FH-227, FH-227B, FH-227C, FH-227D and FH-227E
- Effective: December 31, 1974
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-2057
- Registered aircraft: 1 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B5A1453F0988369986256E0C006720C3.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/73-20-01

## The airworthiness directive

73-20-01 FAIRCHILD: Amendment 39-1721 as amended by Amendment 39-2057. Applies to all Fairchild F-27 and FH-227 Type Aircraft Certificated in all categories.

Compliance required as indicated:

1. Affects front and rear horizontal stabilizer spar fittings, P/N's 27-213003-11, -12 and 27-213002-11 which have accumulated 2500 hours or more in service.

a. Within the next 30 days unless accomplished within the last 11 months, inspect stabilizer spar fittings in accordance with Section 2 of Fairchild Service Bulletins F-27-55-21 and FH-227-55-12, or inspect in accordance with an approved equivalent procedure.

b. The inspections specified in "a" above, shall be repeated at intervals not to exceed 12 calendar months or 2500 hours in service from the last inspection, whichever occurs first.

2. Corroded or cracked parts shall be replaced prior to further flight.

a. Parts replacement shall be in accordance with Section 2 of Fairchild Service Bulletins F-27-55-21 and FH-227-55-12, and shall be of the same part number or approved equivalent parts.

3. The aircraft may be flown in accordance with FAR 21.197 to a base where the inspections or repairs can be performed.

4. Upon submission of substantiating data by an owner or operator through an FAA Maintenance Inspector, the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region, may adjust the inspection interval specified in this AD. Equivalent inspections or parts must be approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region.

(Fairchild Service Bulletins F-27-55-21 and FH-227-55-12 pertain to this subject.)

Amendment 39-1721 was effective September 24, 1973. This amendment 39-2057 is effective December 31, 1974.

## 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 12 of 12 models: FH-227B, FH-227C, FH-227D, F-27, F-27A, F-27M, F-27J, FH-227E…

## 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/73-20-01/models.md
Every aircraft: https://openairdocs.org/ad/73-20-01/aircraft.md

Its text cites no advisory circulars or STCs.

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