AD 49-07-02
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | AT-6 (SNJ-2) | Airworthiness Directives; North American Models BC-1A, AT-6, AT-6A, AT-6B, and AT-6C Aircraft |
| aircraft | The Boeing Company | AT-6A (SNJ-3) | Airworthiness Directives; North American Models BC-1A, AT-6, AT-6A, AT-6B, and AT-6C Aircraft |
| aircraft | The Boeing Company | AT-6B | Airworthiness Directives; North American Models BC-1A, AT-6, AT-6A, AT-6B, and AT-6C Aircraft |
| aircraft | The Boeing Company | AT-6C (SNJ-4) | Airworthiness Directives; North American Models BC-1A, AT-6, AT-6A, AT-6B, and AT-6C Aircraft |
| aircraft | The Boeing Company | BC-1A | Airworthiness Directives; North American Models BC-1A, AT-6, AT-6A, AT-6B, and AT-6C Aircraft |
Unsafe Condition
Engine stoppage on takeoffs and landings when operating on the left tank standpipe outlet with fuel levels down to the standpipe level due to pilot misinterpretation of the left tank fuel gauge and failure to switch to Reserve or Right Hand Main positions before fuel drops below 20 gallons.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install a placard in each cockpit stating: 'CAUTION: Unless Left Tank is full, use Reserve or Right Tank for Takeoff and Landing.'
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
not later than April 1, 1949
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Affected Aircraft
North American Models BC-1A, AT-6, AT-6A, AT-6B, and AT-6C Aircraft (Army designations) and Navy SNJ-2, SNJ-3, SNJ-4 Aircraft
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Federal Register Abstract
Fuel System Placard
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_49-07-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 49-07-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; North American Models BC-1A, AT-6, AT-6A, AT-6B, and AT-6C Aircraft Subject: Fuel System Placard Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: AT-6 (SNJ-2) | AT-6A (SNJ-3) | AT-6B | AT-6C (SNJ-4) | BC-1A Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 49-07-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 49-07-02 SUBJECT HEADING: Airworthiness Directives; North American Models BC-1A, AT-6, AT-6A, AT-6B, and AT-6C Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 49-07-02 NORTH AMERICAN: Applies to Army BC-1A, AT-6, -6A, -6B, -6C: Navy SNJ-2, -3, -4 Aircraft. Compliance required not later than April 1, 1949. Accidents have occurred in the above model aircraft from engine stoppage on takeoffs and landings when operating on the left tank standpipe outlet with the fuel in the tank down to the level of the standpipe. Such engine stoppages have occurred because pilots not fully familiar with the fuel system have misinterpreted the left tank fuel gage as indicating total available fuel quantity with selector valve on the Left Hand Main (standpipe) position, unaware that the change to Reserve or Right Hand Main position must be made before the fuel level in the left tank drops to 20 gallons. To preclude the possibility of pilot error with regard to the foregoing, the following placard shall be installed in each cockpit: "CAUTION: Unless Left Tank is full, use Reserve or Right Tank for Takeoff and Landing." FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_49-07-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 49-07-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; North American Models BC-1A, AT-6, AT-6A, AT-6B, and AT-6C Aircraft Subject: Fuel System Placard Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: AT-6 (SNJ-2) | AT-6A (SNJ-3) | AT-6B | AT-6C (SNJ-4) | BC-1A 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: 49-07-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 49-07-02 SUBJECT HEADING: Airworthiness Directives; North American Models BC-1A, AT-6, AT-6A, AT-6B, and AT-6C Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 49-07-02 NORTH AMERICAN: Applies to Army BC-1A, AT-6, -6A, -6B, -6C: Navy SNJ-2, -3, -4 Aircraft. Compliance required not later than April 1, 1949. Accidents have occurred in the above model aircraft from engine stoppage on takeoffs and landings when operating on the left tank standpipe outlet with the fuel in the tank down to the level of the standpipe. Such engine stoppages have occurred because pilots not fully familiar with the fuel system have misinterpreted the left tank fuel gage as indicating total available fuel quantity with selector valve on the Left Hand Main (standpipe) position, unaware that the change to Reserve or Right Hand Main position must be made before the fuel level in the left tank drops to 20 gallons. To preclude the possibility of pilot error with regard to the foregoing, the following placard shall be installed in each cockpit: "CAUTION: Unless Left Tank is full, use Reserve or Right Tank for Takeoff and Landing." FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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