AD 75-21-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aermacchi S.p.A. | F.260 | Airworthiness Directives; Siai-Marchetti Models F.260 and 260B Airplanes |
| aircraft | Aermacchi S.p.A. | F.260B | Airworthiness Directives; Siai-Marchetti Models F.260 and 260B Airplanes |
Unsafe Condition
Failure of the landing gear actuator relay and subsequent inability to extend the landing gear by normal electrical means.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the landing gear actuator relay P/N 3311-2(10A) with new relay P/N MS 24166-D1(50A) and add a circuit breaker P/N MS 3320-10 in accordance with SIAI-Marchetti Service Bulletin No. 260B5B or FAA-approved equivalent.
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Compliance Time
within the next 10 hours' time in service after the effective date of this AD
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Affected Aircraft
Siai-Marchetti Models F.260 and 260B airplanes, Serial Numbers 101 thru 125, 2-26 thru 2-56, 3-76, 3-77, 3-80, and 502, except Serial Numbers 112, 2-33, 2-37, 2-43, 2-47, 2-53, and 2-54, certificated in all categories.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Landing Gear
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_75-21-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 75-21-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Siai-Marchetti Models F.260 and 260B Airplanes Subject: Landing Gear Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 10/13/1975 Make: Aermacchi S.p.A. Model: F.260 | F.260B Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 75-21-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2378 AD NUMBER: 75-21-01 SUBJECT HEADING: Airworthiness Directives; Siai-Marchetti Models F.260 and 260B Airplanes ACTION: SUMMARY: DATES: Effective October 13, 1975. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 75-21-01 SIAI-MARCHETTI: Amendment 39-2378. Applies to Models F.260 and 260B airplanes, Serial Numbers 101 thru 125, 2-26 thru 2-56, 3-76, 3-77, 3-80, and 502, except Serial Numbers 112, 2-33, 2-37, 2-43, 2-47, 2-53, and 2-54, certificated in all categories. Compliance is required within the next 10 hours' time in service after the effective date of this AD, unless already accomplished. To prevent failure of the landing gear actuator relay and subsequent inability to extend the landing gear by normal electrical means, replace the landing gear actuator relay, P/N 3311- 2(10A), with new relay, P/N MS 24166-D1(50A), and add a circuit breaker, P/N MS 3320-10, in accordance with the accomplishment instructions of SIAI-Marchetti Service Bulletin, S.B. No. 260B5B, dated December 22, 1973, or an FAA-approved equivalent. This amendment becomes effective October 13, 1975. FOOTER:
Document Text
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AD Final Rules - DRS_75-21-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 75-21-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Siai-Marchetti Models F.260 and 260B Airplanes Subject: Landing Gear Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 10/13/1975 Make: Aermacchi S.p.A. Model: F.260 | F.260B 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: 75-21-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2378 AD NUMBER: 75-21-01 SUBJECT HEADING: Airworthiness Directives; Siai-Marchetti Models F.260 and 260B Airplanes ACTION: SUMMARY: DATES: Effective October 13, 1975. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 75-21-01 SIAI-MARCHETTI: Amendment 39-2378. Applies to Models F.260 and 260B airplanes, Serial Numbers 101 thru 125, 2-26 thru 2-56, 3-76, 3-77, 3-80, and 502, except Serial Numbers 112, 2-33, 2-37, 2-43, 2-47, 2-53, and 2-54, certificated in all categories. Compliance is required within the next 10 hours' time in service after the effective date of this AD, unless already accomplished. To prevent failure of the landing gear actuator relay and subsequent inability to extend the landing gear by normal electrical means, replace the landing gear actuator relay, P/N 3311- 2(10A), with new relay, P/N MS 24166-D1(50A), and add a circuit breaker, P/N MS 3320-10, in accordance with the accomplishment instructions of SIAI-Marchetti Service Bulletin, S.B. No. 260B5B, dated December 22, 1973, or an FAA-approved equivalent. This amendment becomes effective October 13, 1975. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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