# AD 91-25-04: Auxiliary Power Units - Type: Airworthiness directive - Status: Current - Products: Airbus A300 B2-1A, A300 B2-1C, A300 B2-203, A300 B2K-3C, A300 B4-103, A300 B4-203, A300 B4-2C, A300 B4-601, A300 B4-603, A300 B4-605R, A300 B4-620, A300 B4-622 and 14 more - Effective: January 7, 1992 - Superseded by: Nothing supersedes this AD - Product type: Appliance - Amendment: 39-8105 - Docket: 91-NM-151-AD - Registered aircraft: 146 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/38CFB72FFF9C42FF86256A3E00765217.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/91-25-04 ## The airworthiness directive 91-25-04 GARRETT AUXILIARY POWER DIVISION: Amendment 39-8105. Docket No. 91-NM-151-AD. Applicability: Model TSCP700-4B auxiliary power units (APU) prior to serial number 90697, as installed in, but not limited to, McDonnell Douglas Model DC-10 and KC-10 (military) series airplanes; and Model TSCP700-5 APU's prior to serial number 80443, as installed in, but not limited to, Airbus Industrie Model A300 series airplanes; certificated in any category. Compliance: Required within 24 months after the effective date of this AD, unless previously accomplished. To prevent uncontained high pressure turbine (HPT) disc failures, accomplish the following: (a) Replace the HPT containment ring, part number (P/N) 976850-1, with P/N 3614975-1; and replace the HPT containment support, P/N 3604274-1, with P/N 3614934-1; in accordance with the accomplishment instructions in Garrett Service Bulletin TSCP700-49-5892, Revision 2, dated October 10, 1990. (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 Maintenance 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 replacement requirements shall be done in accordance with Garrett Service Bulletin TSCP700-49-5892, Revision 2, dated October 10, 1990, which contains the following list of effective pages: Page Number Revision Level Date 1, 7/8 2 October 10, 1990 2, 3/4, 5, 6 Original) May 14, 1990 9/10 1 July 3, 1990 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 Garrett Airlines Services Division, Technical Publications, Department 65-70, P. O. Box 52170, Phoenix, Arizona 85072-2170. Copies may be inspected 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 (39-8105, AD 91-25-04) becomes effective on January 7, 1992. ## Affected data sheets (2) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A35EU](https://openairdocs.org/tcds/A35EU): Airbus SAS; names 9 of 17 models: A300 B4-622R, A300 F4-605R, A300 B4-601, A300 B4-603, A300 B4-622, A300 F4-622R, A300 B4-620, A300 C4-605R Variant F… - [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: 146 (146 by airframe model, 0 by engine model) - Makers: Airbus Industrie 72, Airbus 48, Mcdonnell Douglas 13, Douglas 8, Mcdonnell-Douglas 5 Models with the most aircraft: - [Airbus Industrie A300 F4-605R](https://openairdocs.org/model/airbus-industrie-a300-f4-605r): 36 aircraft (airframe model) - [Airbus A300 F4-622R](https://openairdocs.org/model/airbus-a300-f4-622r): 31 aircraft (airframe model) - [Airbus Industrie A300 F4-622R](https://openairdocs.org/model/airbus-industrie-a300-f4-622r): 21 aircraft (airframe model) - [Mcdonnell Douglas DC-10-30F](https://openairdocs.org/model/mcdonnell-douglas-dc-10-30f): 12 aircraft (airframe model) - [Airbus A300 B4-622R](https://openairdocs.org/model/airbus-a300-b4-622r): 11 aircraft (airframe model) - [Airbus Industrie A300 B4-622R](https://openairdocs.org/model/airbus-industrie-a300-b4-622r): 10 aircraft (airframe model) - [Douglas DC-10-40](https://openairdocs.org/model/douglas-dc-10-40): 6 aircraft (airframe model) - [Airbus A300 F4-605R](https://openairdocs.org/model/airbus-a300-f4-605r): 6 aircraft (airframe model) - [Mcdonnell-Douglas DC-10-30](https://openairdocs.org/model/mcdonnell-douglas-dc-10-30): 5 aircraft (airframe model) - [Airbus Industrie A300 B4-605R](https://openairdocs.org/model/airbus-industrie-a300-b4-605r): 3 aircraft (airframe model) - [Airbus Industrie A300 B4-622](https://openairdocs.org/model/airbus-industrie-a300-b4-622): 2 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 14 models: https://openairdocs.org/ad/91-25-04/models.md Every aircraft: https://openairdocs.org/ad/91-25-04/aircraft.md Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.