After every flight, UPS pilots fill out a form, called a "gripe sheet," which tells mechanics about problems with the aircraft. The mechanics correct the problems; document their repairs on the form, and then pilots review the gripe sheets before the next flight.

Never let it be said that ground crews lack a sense of humor. Here are some actual maintenance complaints submitted by UPS ? pilots (marked with a P) and the solutions recorded (marked with an S) by maintenance engineers. By the way, UPS is the only major airline that has never, ever, had an accident.

P: Left inside main tire almost needs replacement.
S: Almost replaced left inside main tire.

P: Test flight OK, except auto-land very rough.
S: Auto-land not installed on this aircraft.

P: Something loose in cockpit
S: Something tightened in cockpit

P: Dead bugs on windshield.
S: Live bugs on back-order.

P: Autopilot in altitude-hold mode produces a 200 feet per minute descent
S: Cannot reproduce problem on ground.

P: Evidence of leak on right main landing gear.
S: Evidence removed.

P: DME volume unbelievably loud.
S: DME volume set to more believable level.

P: Friction locks cause throttle levers to stick.
S: That?s what friction locks are for.

P: IFF inoperative in OFF mode.
S: IFF always inoperative in OFF mode.

P: Suspected crack in windshield.
S: Suspect you?re right

P: Number 3 engine missing.
S: Engine found on right wing after brief search.

P: Aircraft handles funny. (I love this one!)
S: Aircraft warned to: straighten up, fly right, and be serious.

P: Target radar hums.
S: Reprogrammed target radar with lyrics.

P: Mouse in cockpit.
S: Cat installed.

P: Noise coming from under instrument panel. Sounds like a midget pounding on something with a hammer.
S: Took hammer away from midget.

Found at: http://cruftbucket.com/2007/10/31/aircraft-engineers-funny-guys/