72-11-03 GRUMMAN AIRCRAFT: Amdt. 39-1451. Applies to G-21 and G-21A airplanes (converted military OA-9 and JRF series airplanes under TC 654) certificated in all categories.
Compliance required within the next 25 hours in service after the effective date of this AD, unless already accomplished.
In order to prevent engine fuel starvation due to fuel vaporization within fuel feed lines to the engines, accomplish the following:
Install a permanent placard on or near the instrument panel in full view of the pilot using minimum 1/8 inch lettering to read:
"Cross feed valve must be closed during all flight operations
except for emergencies resulting from engine pump failure."
(Grumman Customer Bulletin No. G21A 72-1 pertains to this subject)
This amendment is effective May 30, 1972.