# AD 91-23-14: Master Caution Warning System

- 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-10-40 and DC-10-40F
- Effective: January 9, 1992
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-8083
- Docket: 91-NM-89-AD
- Registered aircraft: 26 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/707E09A59837BCC786256A080064C355.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/91-23-14

## The airworthiness directive

91-23-14 MCDONNELL DOUGLAS: Amendment 39-8083. Docket No. 91-NM-89-AD.

Applicability: Model DC-10-10, -10F, -15, -30, -30F, -40, -40F, and KC-10A (Military) series airplanes, certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent an unobserved indication that the hydraulic system number 3 shutoff valve has closed, accomplish the following:

  (a) Within 6 months after the effective date of this AD, modify the Master Caution Warning System by installing a wire in accordance with paragraph 2, Accomplishment Instructions, of McDonnell Douglas DC-10 Service Bulletin 29-132, Revision 1, dated August 26, 1991.

  (b) An alternative method of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Los Angeles Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate.

NOTE: The request should be forwarded through an FAA Principal Avionics Inspector, who may concur or comment and then send it to the Manager, Los Angeles ACO.

  (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) The modification requirements shall be done in accordance with McDonnell Douglas DC-10 Service Bulletin 29-132, Revision 1, dated August 26, 1991. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from McDonnell Douglas Corporation, P.O. Box 1771, Long Beach, California, 90801, ATTN: Group Leader, MD-11/DC-10 and DC-8/-8, Service Change Operations, Mail Code 73-30. This information may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington, or at the Los Angeles Aircraft Certification Office, 3229 East Spring Street,Long Beach, California; or at the Office of the Federal Register, 1100 L Street N.W., Room 8401, Washington, D.C.

This amendment (39-8083, AD 91-23-14) becomes effective on January 9, 1992.

## 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/91-23-14/models.md
Every aircraft: https://openairdocs.org/ad/91-23-14/aircraft.md

Its text cites no advisory circulars or STCs.

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