# AD 87-21-04: Inboard Slat Drive Arm

- Type: Airworthiness directive
- Status: Current
- Products: Boeing DC-10-10, DC-10-10F, DC-10-15, DC-10-30, DC-10-30F (KC-10A, KDC-10), DC-10-30F (KC-10A, KDC-10), DC-10-30F (KC-10A, KDC-10), DC-10-40 and DC-10-40F
- Effective: October 30, 1987
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-5737
- Registered aircraft: 26 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7CA42B5044F48DFF862569F2006D7F55.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/87-21-04

## The airworthiness directive

87-21-04 McDONNELL DOUGLAS: Amendment 39-5737. Applies to McDonnell Douglas Model DC-10 and KC-10A series airplanes, certificated in any category. Compliance required as indicated, unless previously accomplished.

To prevent failure of the inboard slat drive arm due to fatigue, accomplish the following:

A. Prior to the accumulation of 10,000 landings, or within 15 days after the effective date of this AD, whichever occurs later, unless previously accomplished within the last 90 days, and thereafter at intervals not to exceed 2,000 landings, inspect the inboard slat drive arm in accordance with the expanded magnetic particle, ultrasonic, or eddy current inspection (Option 2) procedures in the Accomplishment Instructions in McDonnell Douglas Service Bulletin A27-203, Revision 1, dated July 9, 1987, or later FAA-approved revision.

1. If crack(s) are found that are beyond the reworkable limits defined by McDonnell Douglas Service Bulletin A27-203, Revision 1, dated July9, 1987, or later FAA-approved revision, before further flight, replace the cracked arm in accordance with that Service Bulletin.

2. If crack(s) are found that are within the reworkable limits defined by McDonnell Douglas Service Bulletin A27-203, Revision 1, dated July 9, 1987, or later FAA-approved revision, before further flight, rework or replace the arm in accordance with the Accomplishment Instructions in that Service Bulletin.

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

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.

All persons affected by this directive who have not already received the appropriate service information from the manufacturer may obtain copies upon request to McDonnell Douglas Corporation, 3855 Lakewood Boulevard, Long Beach, California 90846, Attention: Director of Publication, C1-L00 (54-60). This information may be examined at the FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or the Los Angeles Aircraft Certification Office, 4344 Donald Douglas Drive, Long Beach, California.

This Amendment becomes effective October 30, 1987.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A22WE](https://openairdocs.org/tcds/A22WE): The Boeing Company; names 7 of 11 models: DC-10-40, DC-10-10F, DC-10-30, DC-10-30F (KC-10A KDC-10), DC-10-10, DC-10-40F, DC-10-15

## 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: 26 (26 by airframe model, 0 by engine model)
- Makers: Mcdonnell Douglas 13, Douglas 8, Mcdonnell-Douglas 5

Models with the most aircraft:

- [Mcdonnell Douglas DC-10-30F](https://openairdocs.org/model/mcdonnell-douglas-dc-10-30f): 12 aircraft (airframe model)
- [Douglas DC-10-40](https://openairdocs.org/model/douglas-dc-10-40): 6 aircraft (airframe model)
- [Mcdonnell-Douglas DC-10-30](https://openairdocs.org/model/mcdonnell-douglas-dc-10-30): 5 aircraft (airframe model)
- [Douglas DC-10-30F](https://openairdocs.org/model/douglas-dc-10-30f): 1 aircraft (airframe model)
- [Mcdonnell Douglas DC-10-30F (KDC-10)](https://openairdocs.org/model/mcdonnell-douglas-dc-10-30f-kdc-10): 1 aircraft (airframe model)
- [Douglas DC-10-40F](https://openairdocs.org/model/douglas-dc-10-40f): 1 aircraft (airframe model)

All 6 models: https://openairdocs.org/ad/87-21-04/models.md
Every aircraft: https://openairdocs.org/ad/87-21-04/aircraft.md

Its text cites no advisory circulars or STCs.

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