# AD 74-04-01: Aft Fuselage Bulkhead Assembly

- Type: Airworthiness directive
- Status: Current
- Products: Cessna 172, 172A, 172B, 172C, 172D, 172E, 172F (USAF T-41A), 172G, 172H (USAF T-41A), 172I, 172K, 172L and 7 more
- Effective: February 12, 1974
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-1783
- Registered aircraft: 20,675 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8560DC9CF2D3E59D86256A3400649047.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/74-04-01

## The airworthiness directive

74-04-01 CESSNA: Amdt. 39-1783. Applies to Model 172 (Serial Numbers 17260759 through 17261495, F17200905 through F-17201034 and FR17200351 through FR17200440) series airplanes.

Compliance: Required as indicated, unless already accomplished.

To detect cracks in the aft fuselage bulkhead assembly and provide means for repair of cracked assemblies, accomplish the following:

A) Within the next 100 hours' time in service after the effective date of this AD, visually inspect the aft fuselage bulkhead assembly (P/N 0512157-7) for cracks in accordance with Cessna Service Letter SE73-37 dated November 16, 1973, or later FAA-approved revisions.

B) If as a result of any inspection required herein, cracks are found, prior to further flight, repair the bulkhead assembly in accordance with Cessna Service Kit SK 172-44.

C) Any alternate methods of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region.

Thisamendment becomes effective February 12, 1974.

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 3A12](https://openairdocs.org/tcds/3A12): Textron Aviation Inc.; names 18 of 18 models: 172F (USAF T-41A), 172M, 172Q, 172R, 172K, 172G, 172A, 172L…
- [TCDS 3A17](https://openairdocs.org/tcds/3A17): Textron Aviation Inc.; names 1 of 12 models: 172RG

## 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: 20,675 (20,675 by airframe model, 0 by engine model)
- Makers: Cessna 19,436, Textron 1,239

Models with the most aircraft:

- [Cessna 172M](https://openairdocs.org/model/cessna-172m): 3,573 aircraft (airframe model)
- [Cessna 172N](https://openairdocs.org/model/cessna-172n): 3,138 aircraft (airframe model)
- [Cessna 172S](https://openairdocs.org/model/cessna-172s): 1,915 aircraft (airframe model)
- [Cessna 172](https://openairdocs.org/model/cessna-172): 1,805 aircraft (airframe model)
- [Textron 172S](https://openairdocs.org/model/textron-172s): 1,239 aircraft (airframe model)
- [Cessna 172P](https://openairdocs.org/model/cessna-172p): 1,111 aircraft (airframe model)
- [Cessna 172K](https://openairdocs.org/model/cessna-172k): 1,026 aircraft (airframe model)
- [Cessna 172L](https://openairdocs.org/model/cessna-172l): 857 aircraft (airframe model)
- [Cessna 172H](https://openairdocs.org/model/cessna-172h): 780 aircraft (airframe model)
- [Cessna 172G](https://openairdocs.org/model/cessna-172g): 722 aircraft (airframe model)
- [Cessna 172F](https://openairdocs.org/model/cessna-172f): 717 aircraft (airframe model)
- [Cessna 172R](https://openairdocs.org/model/cessna-172r): 683 aircraft (airframe model)
- [Cessna 172E](https://openairdocs.org/model/cessna-172e): 617 aircraft (airframe model)
- [Cessna 172D](https://openairdocs.org/model/cessna-172d): 471 aircraft (airframe model)
- [Cessna 172RG](https://openairdocs.org/model/cessna-172rg): 445 aircraft (airframe model)
- [Cessna 172A](https://openairdocs.org/model/cessna-172a): 435 aircraft (airframe model)
- [Cessna 172B](https://openairdocs.org/model/cessna-172b): 413 aircraft (airframe model)
- [Cessna 172C](https://openairdocs.org/model/cessna-172c): 362 aircraft (airframe model)
- [Cessna 172I](https://openairdocs.org/model/cessna-172i): 353 aircraft (airframe model)
- [Cessna 172Q](https://openairdocs.org/model/cessna-172q): 13 aircraft (airframe model)

All 21 models: https://openairdocs.org/ad/74-04-01/models.md
Every aircraft: https://openairdocs.org/ad/74-04-01/aircraft.md

Its text cites no advisory circulars or STCs.

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