# AD 73-13-09: Oil Supply Line Failure

- Type: Airworthiness directive
- Status: Current
- Products: Twin Commander 690
- Effective: June 25, 1973
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-1667
- Registered aircraft: 3 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A66AF7BD6D00FACD86256A38005D96EF.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/73-13-09

## The airworthiness directive

73-13-09 ROCKWELL INTERNATIONAL: Amdt. 39-1667. Applies to Model 690 airplanes, Serial Numbers 11001 through 11063.

Compliance required within the next 50 hours time in service after the effective date of this AD, unless already accomplished.

To prevent failure of oil supply lines in the event of an engine fire, accomplish the following:

Remove existing oil supply hose assembly and install tube assembly (P/N 610488-111), check valve (P/N 816T-6TT (.014)-12), hose assembly (P/N 610488-113), and attaching parts as listed in Rockwell International Service Bulletin 123, dated April 5, 1973, or equivalent parts and methods approved by the Chief, Engineering and Manufacturing Branch, Southwest Region, Federal Aviation Administration, Fort Worth, Texas.

This amendment becomes effective June 25, 1973.

## 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: 690

## 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: 3 (3 by airframe model, 0 by engine model)
- Makers: Aero Commander 3

Models with the most aircraft:

- [Aero Commander 690](https://openairdocs.org/model/aero-commander-690): 3 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/73-13-09/models.md
Every aircraft: https://openairdocs.org/ad/73-13-09/aircraft.md

Its text cites no advisory circulars or STCs.

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