AD 93-05-20
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | MD-11 | Airworthiness Directives; MCDONNELL DOUGLAS MD-11 Series Airplanes |
| aircraft | The Boeing Company | MD-11F | Airworthiness Directives; MCDONNELL DOUGLAS MD-11 Series Airplanes |
Unsafe Condition
Loss of a hydraulic system due to failure of the engine-driven hydraulic pump overtemperature switches.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Modify the wiring to the engine-driven hydraulic pump overtemperature switches in accordance with McDonnell Douglas MD-11 Service Bulletin 29-16. Submit requests for alternative methods of compliance or adjustments to the compliance time through an appropriate FAA Principal Maintenance Inspector.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 60 days after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
MCDONNELL DOUGLAS MD-11 series airplanes equipped with Pratt & Whitney Model PW4460 engines; serial numbers 48407 through 48410, 48443 through 48448, 48452 through 48457, 48461, 48472 through 48475, 48484, 48485, 48495, and 48496.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Hydraulic Pump Overtemperature Switches
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_93-05-20.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 93-05-20 Document Type: AD Final Rules Docket Number: 92-NM-169-AD Subject Heading: Airworthiness Directives; MCDONNELL DOUGLAS MD-11 Series Airplanes Subject: Hydraulic Pump Overtemperature Switches Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 04/30/1993 Make: The Boeing Company Model: MD-11 | MD-11F Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 93-05-20 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 92-NM-169-AD AMENDMENT: 39-8524 AD NUMBER: 93-05-20 SUBJECT HEADING: Airworthiness Directives; MCDONNELL DOUGLAS MD-11 Series Airplanes ACTION: SUMMARY: DATES: Effective April 30, 1993. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 93-05-20 MCDONNELL DOUGLAS: Amendment 39-8524. Docket 92-NM-169-AD. Applicability: Model MD-11 series airplanes equipped with Pratt & Whitney Model PW4460 engines; having airplane serial numbers 48407 through 48410 inclusive, 48443 through 48448 inclusive, 48452 through 48457 inclusive, 48461, 48472 through 48475 inclusive, 48484, 48485, 48495, and 48496; certificated in any category. Compliance: Required as indicated, unless accomplished previously. To prevent loss of a hydraulic system, accomplish the following: (a) Within 60 days after the effective date of this AD, modify the wiring to the engine-driven hydraulic pump overtemperature switches, in accordance with McDonnell Douglas MD-11 Service Bulletin 29-16, dated August 6, 1992. (b) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Los Angeles Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Los Angeles ACO. NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Los Angeles ACO. (c) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished. (d) The modification shall be done in accordance with McDonnell Douglas MD-11 Service Bulletin 29-16, dated August 6, 1992. 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 90846-1771, Attention: Business Unit Manager, Technical Publications - Technical Administrative Support, C1-L5B. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, Transport Airplane Directorate, Los Angeles Aircraft Certification Office (ACO), 3229 East Spring Street, Long Beach, California; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (e) This amendment becomes effective on April 30, 1993. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_93-05-20.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 93-05-20 Document Type: AD Final Rules Docket Number: 92-NM-169-AD Subject Heading: Airworthiness Directives; MCDONNELL DOUGLAS MD-11 Series Airplanes Subject: Hydraulic Pump Overtemperature Switches Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 04/30/1993 Make: The Boeing Company Model: MD-11 | MD-11F Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 93-05-20 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 92-NM-169-AD AMENDMENT: 39-8524 AD NUMBER: 93-05-20 SUBJECT HEADING: Airworthiness Directives; MCDONNELL DOUGLAS MD-11 Series Airplanes ACTION: SUMMARY: DATES: Effective April 30, 1993. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 93-05-20 MCDONNELL DOUGLAS: Amendment 39-8524. Docket 92-NM-169-AD. Applicability: Model MD-11 series airplanes equipped with Pratt & Whitney Model PW4460 engines; having airplane serial numbers 48407 through 48410 inclusive, 48443 through 48448 inclusive, 48452 through 48457 inclusive, 48461, 48472 through 48475 inclusive, 48484, 48485, 48495, and 48496; certificated in any category. Compliance: Required as indicated, unless accomplished previously. To prevent loss of a hydraulic system, accomplish the following: (a) Within 60 days after the effective date of this AD, modify the wiring to the engine-driven hydraulic pump overtemperature switches, in accordance with McDonnell Douglas MD-11 Service Bulletin 29-16, dated August 6, 1992. (b) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Los Angeles Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Los Angeles ACO. NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Los Angeles ACO. (c) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished. (d) The modification shall be done in accordance with McDonnell Douglas MD-11 Service Bulletin 29-16, dated August 6, 1992. 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 90846-1771, Attention: Business Unit Manager, Technical Publications - Technical Administrative Support, C1-L5B. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, Transport Airplane Directorate, Los Angeles Aircraft Certification Office (ACO), 3229 East Spring Street, Long Beach, California; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (e) This amendment becomes effective on April 30, 1993. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.
Related Airworthiness Directives
2025-23-53
final ruleAirworthiness Directives; The Boeing Company Airplanes
Unsafe Condition: The engine-pylon structure of the Model MD-11 and MD-11F airplanes is similar in design to that of the Model MD-10-10F, MD-10-30F, DC-10-10, DC-10-10F, DC-10-15, DC-10-30, DC-10-30F (KC-10A and KDC...
2025-02-07
final ruleAirworthiness Directives; The Boeing Company Airplanes
Unsafe Condition: Loss of GPS data and degraded GPS positional accuracy, which during a high-precision approach with this GPS error, could result in controlled flight into terrain. UTC calculation errors could resul...
2024-24-03 Recurring
final ruleAirworthiness Directives; The Boeing Company Airplanes
Unsafe Condition: uncommanded deployment of a thrust reverser in flight at low altitude, which could result in loss of flight control of the airplane and loss of continued safe flight and landing.
2023-12-15
final ruleAirworthiness Directives; The Boeing Company Airplanes
Unsafe Condition: 5G C-Band interference can cause radio altimeters to not perform their intended function, resulting in increased flightcrew workload while on approach with the flight director, autothrottle, or aut...