# AD 75-19-01: Flap Speed

- Type: Airworthiness directive
- Status: Current
- Products: Twin Commander 685, 690 and 690A
- Effective: September 8, 1975
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-2356
- Registered aircraft: 67 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/97117DD577236F1286256A38005E1877.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/75-19-01

## The airworthiness directive

75-19-01 ROCKWELL: Amendment 39-2356. Applies to Models 690, S/N 11000 and subsequent, 690A, S/N 11100 and subsequent, and 685, S/N 12000 and subsequent.

Compliance required as indicated:

A. Immediately upon receipt of this AD, limit flap speed and deflection as follows:

FLAP SPEED FLAP DEFLECTION MODELS 104 Kts. 40 Degrees 690, 690A, 685 115 Kts. 35 Degrees 690, 690A, 685 128 Kts. 30 Degrees 690, 690A, 685 140 Kts. 27 Degrees 690, 690A, 685 156 Kts. 20 Degrees 690 156 Kts. 20 Degrees 685 180 Kts. 20 Degrees 690A

B. Within 25 hours' time in service after the effective date of this AD, unless already accomplished.

1. Install a limitation placard, covering paragraph A, in accordance with Rockwell International Service Bulletin No. 156 dated June 27, 1975, Revision 1 dated July 3, 1975, or later approved revision, or an equivalent approved by the Chief, Engineering and Manufacturing Branch, Flight Standards Division, SouthwestRegion, Federal Aviation Administration, Fort Worth, Texas.

2. Inspect flap bracket P/N 510003-92 for cracks.

a. If cracks are found, modify the flap bracket in accordance with Rockwell International Service Bulletin No. 157 dated July 16, 1975, or an equivalent approved by the Chief, Engineering and Manufacturing Branch, Flight Standards Division, Southwest Region, Federal Aviation Administration, Fort Worth, Texas, and install prior to further flight. A special flight permit pursuant to FAR 21.197 may be issued to allow ferrying of the aircraft to a facility where the required maintenance can be performed. Flaps should not be operated during ferry flight. Following modification, the placard required by paragraph B may then be removed and the limitations specified in paragraph A may be disregarded.

b. If no cracks are found, continue to operate the aircraft in accordance with the limitations specified in paragraph A. Reinspect at intervals of 25 hours thereafter, and within the next 100 hours' time in service, accomplish the modification specified in paragraph B(2)(a). Upon installation of this modification, the placard required by paragraph B may be removed and the limitation specified in paragraph A may be disregarded.

Amendment 39-2356 supersedes AD 75-15-01.

This amendment becomes effective on receipt of an individual copy or on September 8, 1975, whichever occurs first.

## 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 3 of 21 models: 690A, 685, 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: 67 (67 by airframe model, 0 by engine model)
- Makers: Rockwell International 34, Aero Commander 33

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)
- [Aero Commander 685](https://openairdocs.org/model/aero-commander-685): 8 aircraft (airframe model)
- [Aero Commander 690](https://openairdocs.org/model/aero-commander-690): 3 aircraft (airframe model)

All 4 models: https://openairdocs.org/ad/75-19-01/models.md
Every aircraft: https://openairdocs.org/ad/75-19-01/aircraft.md

Its text cites no advisory circulars or STCs.

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