AD 73-06-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Twin Commander Aircraft LLC | 500 | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 500-A | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 500-B | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 500-U | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 520 | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 560 | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 560-A | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 560-E | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 560-F | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 680 | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 680-E | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 680-F | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 680-FL | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 680-FL(P) | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 680-F(P) | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 720 | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
Unsafe Condition
Failure to prevent siphoning of fuel from the fuel tanks could lead to fuel exhaustion and resultant stoppage of both engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace standard fuel cap assemblies with non-siphoning fuel cap assemblies using Aero Commander Kit No. 87A-1 or 87A-2, depending on model and serial number. Equivalent replacement parts approved by the FAA may be used.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 200 hours' time in service after the effective date of this AD, unless already accomplished. The compliance time may be adjusted up to a maximum of 50 hours to coincide with the aircraft's annual or 100 hour scheduled inspection.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Aero Commander Models 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P), and 720 series airplanes, with specific serial ranges as specified in the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Fuel Siphoning
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_73-06-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 73-06-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 6...Show more Subject: Fuel Siphoning Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 03/19/1973 Make: Twin Commander Aircraft LLC Model: 500 | 500-A | 500-B | 500-U | 520 | 560 | 560-A | 560-E | 560-F | 680 | 680-E | 680-F | 680-FL | 680...Show more 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: 73-06-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1606 AD NUMBER: 73-06-02 SUBJECT HEADING: Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes ACTION: SUMMARY: DATES: Effective March 19, 1973. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 73-06-02 AERO COMMANDER: Amdt. 39-1606. Applies to all Models 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 series airplanes certificated in all categories. Compliance required within the next 200 hours' time in service after the effective date of this AD, unless already accomplished. To prevent siphoning of fuel from the fuel tanks and thereby contribute to fuel exhaustion with resultant stoppage of both engines, accomplish the following: a. On Models 520 and 560, serial numbers 1 through 230, replace the standard fuel cap assemblies with non-siphoning fuel cap assemblies, Aero Commander Kit No. 87A-1. b. On the following models, replace the standard fuel cap assemblies with non- siphoning fuel cap assemblies, Aero Commander Kit No. 87A-2 (optional fuel caps already installed by use of Aero Commander Kit No. 87 are acceptable): (1) Models 500, 500A, 500B, 500U, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL(P) and 720, serial numbers 231 through 1854. (2) Model 680FL, serial numbers 1261 through 1738. c. The compliance time for this AD may be adjusted up to a maximum of 50 hours to coincide with the aircraft's annual or 100 hour scheduled inspection. Aero Commander Custom Kit No. 87A contains the hardware and instructions necessary to accomplish this modification. Equivalent replacement parts approved by the Chief, Engineering and Manufacturing Branch, Flight Standards Division, Southwest Region, Federal Aviation Administration, Fort Worth, Texas, may be used. This amendment becomes effective March 19, 1973. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_73-06-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 73-06-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 6...Show more Subject: Fuel Siphoning Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 03/19/1973 Make: Twin Commander Aircraft LLC Model: 500 | 500-A | 500-B | 500-U | 520 | 560 | 560-A | 560-E | 560-F | 680 | 680-E | 680-F | 680-FL | 680...Show more 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: 73-06-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1606 AD NUMBER: 73-06-02 SUBJECT HEADING: Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes ACTION: SUMMARY: DATES: Effective March 19, 1973. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 73-06-02 AERO COMMANDER: Amdt. 39-1606. Applies to all Models 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 series airplanes certificated in all categories. Compliance required within the next 200 hours' time in service after the effective date of this AD, unless already accomplished. To prevent siphoning of fuel from the fuel tanks and thereby contribute to fuel exhaustion with resultant stoppage of both engines, accomplish the following: a. On Models 520 and 560, serial numbers 1 through 230, replace the standard fuel cap assemblies with non-siphoning fuel cap assemblies, Aero Commander Kit No. 87A-1. b. On the following models, replace the standard fuel cap assemblies with non- siphoning fuel cap assemblies, Aero Commander Kit No. 87A-2 (optional fuel caps already installed by use of Aero Commander Kit No. 87 are acceptable): (1) Models 500, 500A, 500B, 500U, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL(P) and 720, serial numbers 231 through 1854. (2) Model 680FL, serial numbers 1261 through 1738. c. The compliance time for this AD may be adjusted up to a maximum of 50 hours to coincide with the aircraft's annual or 100 hour scheduled inspection. Aero Commander Custom Kit No. 87A contains the hardware and instructions necessary to accomplish this modification. Equivalent replacement parts approved by the Chief, Engineering and Manufacturing Branch, Flight Standards Division, Southwest Region, Federal Aviation Administration, Fort Worth, Texas, may be used. This amendment becomes effective March 19, 1973. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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