AD 60-13-03

60-13-03 LOCKHEED: Amdt. 176 Part 507 Federal Register June 24, 1960. Applies to All 188 Airplanes Not Equipped With Fuel Tank Pressure Relief Overflow Valves.

Compliance required as indicated.

Service experience indicates that a check of the fueling system valves at a high fuel level point should be made when filling tanks to capacity. This check is necessary to determine that the system is functioning properly since failure of a fueling valve to close fully may subject the tank to high fuel pressure which could cause not only tank rupture but structural damage. To prevent possible fuel tank overpressurizing, the following actions are required commencing not later than 10 days after publication of this airworthiness directive in the Federal Register.

(a) Conduct a check of the fueling system at the start of each fueling operation in accordance with the placard located on the fueling panel.

(b) (1) On all outboard tanks and on extended inboard tanks, when installed,conduct a second check of the primary and secondary controls between 8,000 and 10,000 pounds fuel per item 2 on the placard.

(2) When standard inboard tanks are installed, conduct a second check of the primary and secondary controls between 4,500 and 6,500 pounds fuel.

(c) Any malfunctions indicated by the checks required by items (a) and (b) of this airworthiness directive must be corrected prior to continuance of pressure fueling to that tank.

(d) The fueling panel will be monitored during the entire fueling operation.

This supersedes paragraph (d) of AD 60-09-03.