A yellow plastic cover with a clear window near the middle. In black is the insignia of the RAAF and royal Australian Air Force is under this. just aove the window reads Engineering Publication. Through the window on yellow cardboard reads AAP 7531.089-3M Altimeter Sensitive etc.royal australian airforce - manuals, royal australian air force, altimeter sensitive, engineering publication

A yellow plastic cover with a clear window. Top right had in black texta reads AAP 7513.053-3M. In black reads Royal Australian Airforce with their insignia above. Under this reads Engineering Publication. Throug the window on yellow cardboard reads AAP 7513.053-3M Fuel Contents Gauge Amplifier Including Code No. FAA (Smiths)royal australian airforce - manuals, royal australian air force, engineering publication, fueld contents gauge amplifier