# AD 83-06-03: MLG Support Structure

- Type: Airworthiness directive
- Status: Current
- Products: Boeing DC-9-31, DC-9-32, DC-9-32 (VC-9C), DC-9-32F, DC-9-32F (C-9A), DC-9-32F (C-9B), DC-9-33F, DC-9-34, DC-9-34F, DC-9-41 and DC-9-51
- Effective: April 28, 1983
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-4590
- Registered aircraft: 7 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/24EE63FDAD9E816B862569F20069E3FC.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/83-06-03

## The airworthiness directive

83-06-03 MCDONNELL DOUGLAS: Amendment 39-4590. Applies to McDonnell Douglas Model DC-9-30, -40, and -50 series airplanes, with the following MLG strut serial numbers installed: R4429N, R4430 through R4436, R4438 through R4449, R4462 through R4469, R5415 through R5420, R7475, R7476, R7478 through R7526, R8734, R8736, R8742, and R8743, certificated in all categories. Compliance required prior to December 14, 1983, unless previously accomplished.

To prevent failure of the main landing gear support structure, accomplish the following:

A. Perform an eddy current inspection to determine the heat treat condition of the restrictor support tube in accordance with the Accomplishment Instructions of McDonnell Douglas DC-9 Service Bulletin 32-186, original issue, dated January 29, 1982, or later revisions approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region.

B. Replace restrictor tubes if any are found to be improperly heat treated in accordance with the above service bulletin.

C. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD.

D. Alternate means of compliance which provide an equivalent level of safety may be used when approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region.

All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to McDonnell Douglas Corporation, 3855 Lakewood Boulevard, Long Beach, California 90846, Attention: Director, Publications and Training, C1-750 (54-60). These documents also may be examined at FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington 98168, or Los Angeles Aircraft Certification Office, 4344 Donald Douglas Drive, Long Beach, California 90808.

This amendment becomes effective April 28, 1983.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A6WE](https://openairdocs.org/tcds/A6WE): The Boeing Company; names 8 of 25 models: DC-9-41, DC-9-34F, DC-9-33F, DC-9-51, DC-9-31, DC-9-32F, DC-9-32 (VC-9C), DC-9-34

## 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: 7 (7 by airframe model, 0 by engine model)
- Makers: Mcdonnell Douglas 5, Douglas 2

Models with the most aircraft:

- [Mcdonnell Douglas DC-9-33F](https://openairdocs.org/model/mcdonnell-douglas-dc-9-33f): 3 aircraft (airframe model)
- [Douglas DC-9-32F](https://openairdocs.org/model/douglas-dc-9-32f): 1 aircraft (airframe model)
- [Mcdonnell Douglas DC-9-32](https://openairdocs.org/model/mcdonnell-douglas-dc-9-32): 1 aircraft (airframe model)
- [Mcdonnell Douglas DC-9-32F](https://openairdocs.org/model/mcdonnell-douglas-dc-9-32f): 1 aircraft (airframe model)
- [Douglas DC-9-33F](https://openairdocs.org/model/douglas-dc-9-33f): 1 aircraft (airframe model)

All 5 models: https://openairdocs.org/ad/83-06-03/models.md
Every aircraft: https://openairdocs.org/ad/83-06-03/aircraft.md

Its text cites no advisory circulars or STCs.

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