Service difficulty program, general aviation.
Series: AC ; 20-109
Publisher: Dept. of Transportation, Federal Aviation Administration
Published: 1979
Place of publication: Washington
Language: eng
Subjects: Airplanes -- Inspection.
Notes: Caption title.

"Advisory circular."

Jan. 8, 1979.

Replaces AC 20--23 D, issued Feb. 12, 1971.