dirty

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dirty

1. (of a colour) not clear and bright; impure
2. (of an aircraft) having projections into the airstream, such as lowered flaps

dirty

An aircraft configuration in flight with the undercarriage and/or flaps down. Airbrakes or spoilers may or may not be extended.
References in periodicals archive ?
When an inspection by a Senior Officer was about to take place his Company Commander would see that Morgan did not appear, he was hidden away somewhere out of sight because he was always dirtily turned out, boots dished, tunic torn, hat turned up at the wrong angle and altogether most unsoldierly in appearance, but when in the line, was truly wonderful and worth half a dozen ordinary men for his initiative and bravery'.
It involved nudity and all that stuff, which was dirtily handled.