AD 81-20-04 R1
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 727-200 Series | BOEING Model 727-200 and 737 Airplanes |
| aircraft | The Boeing Company | 737-100 Series | BOEING Model 727-200 and 737 Airplanes |
| aircraft | The Boeing Company | 737-200 Series | BOEING Model 727-200 and 737 Airplanes |
| aircraft | The Boeing Company | 737-200C Series | BOEING Model 727-200 and 737 Airplanes |
| aircraft | The Boeing Company | 737-300 Series | BOEING Model 727-200 and 737 Airplanes |
| aircraft | The Boeing Company | 737-400 Series | BOEING Model 727-200 and 737 Airplanes |
| aircraft | The Boeing Company | 737-500 Series | BOEING Model 727-200 and 737 Airplanes |
| aircraft | The Boeing Company | 737-600 Series | BOEING Model 727-200 and 737 Airplanes |
| aircraft | The Boeing Company | 737-700 Series | BOEING Model 727-200 and 737 Airplanes |
| aircraft | The Boeing Company | 737-800 Series | BOEING Model 727-200 and 737 Airplanes |
Unsafe Condition
Inflight fires can occur due to the use of Hamilton Standard electronic pressurization controllers with HS part numbers 710204-7, 710204-8, 761260-7, or 761260-8 that have not been modified to HS reference P57.
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Required Actions
Modify the Hamilton Standard pressurization controllers listed in the AD by following Boeing Service Bulletins 727-21 A96 or 737-21 A1064, or an FAA-approved alternative. The Assurance of Serviceability testing from Hamilton Standard Service Bulletin 21-88, Rev 1 may substitute for the full functional test in the Boeing bulletins.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
on or before May 12, 1982
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Affected Aircraft
Boeing Model 727-200 series and 737 airplanes using Hamilton Standard pressurization controllers with HS part numbers 710204-7, 710204-8, 761260-7, or 761260-8 that have not been modified to HS reference P57.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Hamilton Standard Pressurization Controllers
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_81-20-04_R.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 81-20-04 R1 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: BOEING Model 727-200 and 737 Airplanes Subject: Hamilton Standard Pressurization Controllers Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 11/13/1981 Make: The Boeing Company Model: 727-200 Series | 737-100 Series | 737-200 Series | 737-200C Series | 737-300 Series | 737-400 Series...Show more 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: 81-20-04 R1 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-4250 AD NUMBER: 81-20-04 R1 SUBJECT HEADING: BOEING Model 727-200 and 737 Airplanes ACTION: SUMMARY: DATES: Effective November 13, 1981. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 81-20-04 R1 BOEING: Amendment 39-4225 as amended by Amendment 39-4250. Applies to Boeing Model 727-200 series and 737 airplanes, certificated in all categories, using the following Hamilton Standard electronic pressurization controllers that have not been previously modified to HS reference number P57: HS Part Number Boeing Part Number 710204-7 10-61209-13 710204-8 10-61209-14 761260-7 10-61209-19 761260-8 10-61209-18 To prevent inflight fires, on or before May 12, 1982, accomplish the following, unless already accomplished: Modify the Hamilton Standard pressurization controllers listed above in accordance with Boeing Service Bulletins 727-21 A96 and 737-21 A1064, published August 28, 1981, or later FAA approved revision, or in a manner approved by the Chief, Seattle Area Aircraft Certification Office. The Assurance of Serviceability testing described in Paragraph B(16) of Hamilton Standard Service Bulletin 21-88, Revision 1, dated October 13, 1981, may be used in lieu of the complete functional test specified in the Boeing Service Bulletins listed above. The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received the above specified Alert Service Bulletin from the manufacturer may obtain copies upon request to Boeing Commercial Airplane Company, P.O. Box 3707, Seattle, Washington 98124, or it may also be examined at FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington 98108. Amendment 39-4225 became effective October 13, 1981. This amendment 39-4250 becomes effective November 13, 1981. FOOTER:
Document Text
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AD Final Rules - DRS_81-20-04_R.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 81-20-04 R1 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: BOEING Model 727-200 and 737 Airplanes Subject: Hamilton Standard Pressurization Controllers Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 11/13/1981 Make: The Boeing Company Model: 727-200 Series | 737-100 Series | 737-200 Series | 737-200C Series | 737-300 Series | 737-400 Series...Show more 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: 81-20-04 R1 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-4250 AD NUMBER: 81-20-04 R1 SUBJECT HEADING: BOEING Model 727-200 and 737 Airplanes ACTION: SUMMARY: DATES: Effective November 13, 1981. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 81-20-04 R1 BOEING: Amendment 39-4225 as amended by Amendment 39-4250. Applies to Boeing Model 727-200 series and 737 airplanes, certificated in all categories, using the following Hamilton Standard electronic pressurization controllers that have not been previously modified to HS reference number P57: HS Part Number Boeing Part Number 710204-7 10-61209-13 710204-8 10-61209-14 761260-7 10-61209-19 761260-8 10-61209-18 To prevent inflight fires, on or before May 12, 1982, accomplish the following, unless already accomplished: Modify the Hamilton Standard pressurization controllers listed above in accordance with Boeing Service Bulletins 727-21 A96 and 737-21 A1064, published August 28, 1981, or later FAA approved revision, or in a manner approved by the Chief, Seattle Area Aircraft Certification Office. The Assurance of Serviceability testing described in Paragraph B(16) of Hamilton Standard Service Bulletin 21-88, Revision 1, dated October 13, 1981, may be used in lieu of the complete functional test specified in the Boeing Service Bulletins listed above. The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received the above specified Alert Service Bulletin from the manufacturer may obtain copies upon request to Boeing Commercial Airplane Company, P.O. Box 3707, Seattle, Washington 98124, or it may also be examined at FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington 98108. Amendment 39-4225 became effective October 13, 1981. This amendment 39-4250 becomes effective November 13, 1981. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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