# AD 51-10-04: Cowl Mounting Channels

- Type: Airworthiness directive
- Status: Current
- Products: Cessna 190
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 74 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/18C82EEEEA51644786256A3400614B0E.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/51-10-04

## The airworthiness directive

51-10-04 CESSNA: Applies to Model 190 Aircraft, Serial Numbers 7004 Through 7594.

Inspection required not later than May 1, 1951, and every 25 hours of operation thereafter until new cowl mounting ring channels and channel stiffening angles are installed.

Due to cracking and failures of the cowl mounting ring channels which, if undetected, may result in the cowl moving forward into the propeller, the cowl mounting channels must be closely inspected for cracks with particular attention being paid to the sections which bear against the cowl mounting lugs. This inspection must be repeated every 25 hours of operation until the presently installed 1010 steel cowl mounting channels are replaced with 4130 steel cowl mounting channels, Cessna P/N 0352161, 0352163, and 0352163-1, and aluminum alloy cowl channel reinforcing angles, Cessna P/N 0352146, 0352147-1, 0352147-2, 0352152-5, and 0352152-6 are installed. In the event that inspection reveals any indication of cracks, the new cowl mounting channels and reinforcing angles must be installed immediately.

(Cessna Service Letter No. 13 dated March 29, 1951, covers this same subject.)

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-790](https://openairdocs.org/tcds/A-790): Textron Aviation Inc.; names 1 of 4 models: 190

## 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: 74 (74 by airframe model, 0 by engine model)
- Makers: Cessna 74

Models with the most aircraft:

- [Cessna 190](https://openairdocs.org/model/cessna-190): 74 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/51-10-04/models.md
Every aircraft: https://openairdocs.org/ad/51-10-04/aircraft.md

Its text cites no advisory circulars or STCs.

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