# AD 74-20-12: Pilot and Co-pilot Side Windows

- Type: Airworthiness directive
- Status: Current
- Products: Twin Commander 690A
- Effective: October 4, 1974
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-1979
- Registered aircraft: 56 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9DAC824EF7AA63D286256A38005DAF8B.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/74-20-12

## The airworthiness directive

74-20-12 COMMANDER AIRCRAFT DIVISION, ROCKWELL INTERNATIONAL: Amendment 39-1979. Applies to Rockwell Model 690A series airplanes, S/N 11100 through 11197.

Compliance required as indicated unless already accomplished.

1. Before the first flight of each day after the effective date of this A.D., check the cutout around the openable pilot's and co-pilot's side windows for cracks.

2. If cracks are found in either side window, replace the openable side window with a non-openable side window, P/N 360012-501, before further flight, except flight with cabin unpressurized may be made in accordance with FAR 21.197 to a base where the replacement can be accomplished.

3. Within 50 hours' time in service after the effective date of this A.D., unless already accomplished, replace all openable side windows, with a non-openable side window, P/N 360012-501, in accordance with Rockwell Service Bulletin 143 dated September 10, 1974, or an equivalent method approved by the Chief,Engineering and Manufacturing Branch, Flight Standards Division, Southwest Region, Fort Worth, Texas.

This amendment becomes effective October 4, 1974.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 2A4](https://openairdocs.org/tcds/2A4): Twin Commander Aircraft LLC; names 1 of 21 models: 690A

## 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: 56 (56 by airframe model, 0 by engine model)
- Makers: Rockwell International 34, Aero Commander 22

Models with the most aircraft:

- [Rockwell International 690A](https://openairdocs.org/model/rockwell-international-690a): 34 aircraft (airframe model)
- [Aero Commander 690A](https://openairdocs.org/model/aero-commander-690a): 22 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/74-20-12/models.md
Every aircraft: https://openairdocs.org/ad/74-20-12/aircraft.md

Its text cites no advisory circulars or STCs.

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