When the light comes on, it must illuminate the rear reflector.

Erase the flight data from the tape.

Use a drill bit that is maximum 45 mm long.

Those units and components are used for recording data not related to specific systems.

There is no indication of single loop operation in the flight compartment until you do the OVHT/FIRE test.

Each of the two life vests located at L2 entry door flight crew station expired.

"EMERGENCY EXIT" placard at exit hatch over Left wing is illegible.

This commonality permits greater ease of learning and understanding for pilots, aircraft maintenance technicians and engineers alike.

Flush the filter with hot water.

Examine the drain holes for blockage.

Clean the surface with a soap-and-water solution.