AD 72-05-01
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet Inc. | 23 | Airworthiness Directives; GATES LEARJET Model 23 Airplanes |
Unsafe Condition
Loss of flaps due to failure of the flap actuator rod end.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the flap actuator rod end with a new part in accordance with Gates Learjet Service Bulletin 23-231 or an equivalent part approved by the FAA.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within specified time frames based on airplane hours' time in service: 25 hours after effective date for airplanes with 4,000+ hours, 150 hours after effective date or before 4,025 total hours for 3,851-3,999 hours, and within 150 hours after effective date for 2,350-3,850 hours.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Gates Learjet Model 23 airplanes, Serial Numbers 23-003 thru 23-089, except those modified with Model 24 Flap System.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Flap Actuator Rod End
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_72-05-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 72-05-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; GATES LEARJET Model 23 Airplanes Subject: Flap Actuator Rod End Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 02/29/1972 Make: Learjet Inc. Model: 23 Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 72-05-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1397 AD NUMBER: 72-05-01 SUBJECT HEADING: Airworthiness Directives; GATES LEARJET Model 23 Airplanes ACTION: SUMMARY: DATES: Effective February 29, 1972. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 72-05-01 GATES LEARJET: Amdt. 39-1397. Applies to Model 23 airplanes, Serial Numbers 23-003 thru 23-089, except those airplanes which have been modified to incorporate the Gates Learjet Model 24 Flap System. Compliance: Required as indicated, unless already accomplished. To prevent loss of flaps: 1) Within 25 hours' time in service after the effective date of this AD on those airplanes with 4,000 or more hours' in service, 2) Within 150 hours' time in service after the effective date of this AD, but no later than 4,025 hours' total airplane time, whichever occurs first, on those airplanes having between 3,851 and 3,999 hours' time in service, and 3) Within the next 150 hours' time in service after the effective date of this AD on those airplanes having between 2,350 and 3,850 hours' time in service, accomplish the following: Replace the flap actuator rod end with a new part in accordance with Gates Learjet Service Bulletin 23-231, dated February 17, 1972, or any equivalent part approved by Chief, Engineering and Manufacturing Branch, FAA, Central Region. NOTE: The type design data and the airplane service manual are being revised to specify a mandatory retirement life of 2,500 hours for the flap actuator rod end for applicable aircraft. This amendment becomes effective February 29, 1972. FOOTER:
Document Text
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AD Final Rules - DRS_72-05-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 72-05-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; GATES LEARJET Model 23 Airplanes Subject: Flap Actuator Rod End Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 02/29/1972 Make: Learjet Inc. Model: 23 Product Type: Aircraft Product Subtype: Small 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: 72-05-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1397 AD NUMBER: 72-05-01 SUBJECT HEADING: Airworthiness Directives; GATES LEARJET Model 23 Airplanes ACTION: SUMMARY: DATES: Effective February 29, 1972. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 72-05-01 GATES LEARJET: Amdt. 39-1397. Applies to Model 23 airplanes, Serial Numbers 23-003 thru 23-089, except those airplanes which have been modified to incorporate the Gates Learjet Model 24 Flap System. Compliance: Required as indicated, unless already accomplished. To prevent loss of flaps: 1) Within 25 hours' time in service after the effective date of this AD on those airplanes with 4,000 or more hours' in service, 2) Within 150 hours' time in service after the effective date of this AD, but no later than 4,025 hours' total airplane time, whichever occurs first, on those airplanes having between 3,851 and 3,999 hours' time in service, and 3) Within the next 150 hours' time in service after the effective date of this AD on those airplanes having between 2,350 and 3,850 hours' time in service, accomplish the following: Replace the flap actuator rod end with a new part in accordance with Gates Learjet Service Bulletin 23-231, dated February 17, 1972, or any equivalent part approved by Chief, Engineering and Manufacturing Branch, FAA, Central Region. NOTE: The type design data and the airplane service manual are being revised to specify a mandatory retirement life of 2,500 hours for the flap actuator rod end for applicable aircraft. This amendment becomes effective February 29, 1972. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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