# AD 67-28-01: Lower Front Spar Cap

- Type: Airworthiness directive
- Status: Current
- Products: Twin Commander 560-E, 680, 680-E and 720
- Effective: October 10, 1967
- Published: October 10, 1967
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-492
- Registered aircraft: 22 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/196062DC32727A4986256A38005D5451.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/67-28-01

## The airworthiness directive

67-28-01 AERO COMMANDER: Amdt. 39-492, Part 39, Federal Register October 10, 1967. Applies to Models 560E, 680, 680E, and 720 Airplanes.

Compliance required within the next 25 hours' time in service after the effective date of this AD unless already accomplished.

To detect cracks in the lower front spar cap between wing station 67 and 86 on each wing, accomplish either (a) or (b) of the following:

  (a) Perform visual and dye penetrant inspection in accordance with Aero Commander Service Bulletin Number 92 dated September 29, 1967. To facilitate inspection, a top wing access door may be installed in accordance with instructions contained in Aero Commander's letter to all owners and operators dated October 3, 1967.

  (b) Inspect in accordance with procedures approved by the Chief, Engineering and Manufacturing Branch, FAA, Southwest Region, Fort Worth, Texas.

If cracks are detected during above inspections, contact Aero Commander for approved repair or repairin accordance with a method approved by the Chief, Engineering and Manufacturing Branch, FAA, Southwest Region, Fort Worth, Texas.

Upon completion of the inspection, positive or negative findings including total time in service shall be forwarded to the Chief, Engineering and Manufacturing Branch, FAA, Southwest Region, Fort Worth, Texas.

This amendment effective upon publication in the Federal Register for all persons except those to whom it was made effective immediately by air mail letter dated October 5, 1967.

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 2A4](https://openairdocs.org/tcds/2A4): Twin Commander Aircraft LLC; names 3 of 21 models: 680-E, 720, 680
- [TCDS 6A1](https://openairdocs.org/tcds/6A1): Twin Commander Aircraft LLC; names 1 of 9 models: 560E

## 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: 22 (22 by airframe model, 0 by engine model)
- Makers: Aero Commander 22

Models with the most aircraft:

- [Aero Commander 680](https://openairdocs.org/model/aero-commander-680): 12 aircraft (airframe model)
- [Aero Commander 560-E](https://openairdocs.org/model/aero-commander-560-e): 5 aircraft (airframe model)
- [Aero Commander 680-E](https://openairdocs.org/model/aero-commander-680-e): 4 aircraft (airframe model)
- [Aero Commander 720](https://openairdocs.org/model/aero-commander-720): 1 aircraft (airframe model)

All 4 models: https://openairdocs.org/ad/67-28-01/models.md
Every aircraft: https://openairdocs.org/ad/67-28-01/aircraft.md

Its text cites no advisory circulars or STCs.

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