AD 90-20-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus SAS | BAC 1-11 200 Series | Airworthiness Directives; British Aerospace Model BAC 1-11 200 and 400 Series Airplanes |
| aircraft | Airbus SAS | BAC 1-11 400 Series | Airworthiness Directives; British Aerospace Model BAC 1-11 200 and 400 Series Airplanes |
Unsafe Condition
Failure of the APU air intake plenum overheat detection could result in undetected overheating and potential structural damage.
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Required Actions
Install temperature sensors in the APU air intake plenum per British Aerospace Alert Service Bulletin 49-A-PM5955, Issue 1, dated April 13, 1988. Alternate means of compliance or adjustments may be approved by the FAA Manager, Standardization Branch, ANM-113.
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Compliance Time
within 30 days after the effective date of this AD
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Affected Aircraft
British Aerospace Model BAC 1-11 200 and 400 Series airplanes, certificated in any category.
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Federal Register Abstract
APU Air Intake Plenum
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_90-20-07.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 90-20-07 Document Type: AD Final Rules Docket Number: 90-NM-102-AD Subject Heading: Airworthiness Directives; British Aerospace Model BAC 1-11 200 and 400 Series Airplanes Subject: APU Air Intake Plenum Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 10/23/1990 Make: Airbus SAS Model: BAC 1-11 200 Series | BAC 1-11 400 Series Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 90-20-07 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 90-NM-102-AD AMENDMENT: 39-6729 AD NUMBER: 90-20-07 SUBJECT HEADING: Airworthiness Directives; British Aerospace Model BAC 1-11 200 and 400 Series Airplanes ACTION: SUMMARY: DATES: Effective on October 23, 1990. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 90-20-07 BRITISH AEROSPACE: Amendment 39-6729. Docket No. 90-NM-102-AD. Applicability: Model BAC 1-11 200 and 400 series airplanes, certificated in any category. Compliance: Required within 30 days after the effective date of this AD, unless previously accomplished. To provide auxiliary power unit (APU) air intake plenum overheat detection, accomplish the following: A. Install temperature sensors in the APU air intake plenum, in accordance with British Aerospace Alert Service Bulletin 49-A-PM5955, Issue 1, dated April 13, 1988. B. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate. NOTE: The request should be submitted directly to the Manager, Standardization Branch, ANM-113, and a copy sent to the cognizant FAA Principal Inspector (PI). The PI will then forward comments or concurrence to the Manager, Standardization Branch, ANM-113. 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 documents from the manufacturer may obtain copies upon request to British Aerospace PLC, Librarian for Service Bulletins, P.O. Box 17414, Dulles International Airport, Washington, D.C. 20041-0414. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington. This amendment (39-6729, AD 90-20-07) becomes effective on October 23, 1990. FOOTER:
Document Text
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AD Final Rules - DRS_90-20-07.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 90-20-07 Document Type: AD Final Rules Docket Number: 90-NM-102-AD Subject Heading: Airworthiness Directives; British Aerospace Model BAC 1-11 200 and 400 Series Airplanes Subject: APU Air Intake Plenum Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 10/23/1990 Make: Airbus SAS Model: BAC 1-11 200 Series | BAC 1-11 400 Series 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: 90-20-07 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 90-NM-102-AD AMENDMENT: 39-6729 AD NUMBER: 90-20-07 SUBJECT HEADING: Airworthiness Directives; British Aerospace Model BAC 1-11 200 and 400 Series Airplanes ACTION: SUMMARY: DATES: Effective on October 23, 1990. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 90-20-07 BRITISH AEROSPACE: Amendment 39-6729. Docket No. 90-NM-102-AD. Applicability: Model BAC 1-11 200 and 400 series airplanes, certificated in any category. Compliance: Required within 30 days after the effective date of this AD, unless previously accomplished. To provide auxiliary power unit (APU) air intake plenum overheat detection, accomplish the following: A. Install temperature sensors in the APU air intake plenum, in accordance with British Aerospace Alert Service Bulletin 49-A-PM5955, Issue 1, dated April 13, 1988. B. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate. NOTE: The request should be submitted directly to the Manager, Standardization Branch, ANM-113, and a copy sent to the cognizant FAA Principal Inspector (PI). The PI will then forward comments or concurrence to the Manager, Standardization Branch, ANM-113. 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 documents from the manufacturer may obtain copies upon request to British Aerospace PLC, Librarian for Service Bulletins, P.O. Box 17414, Dulles International Airport, Washington, D.C. 20041-0414. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington. This amendment (39-6729, AD 90-20-07) becomes effective on October 23, 1990. FOOTER:
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Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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