Cockpit noise and speech interference between crewmembers.
Contributors: United States. Federal Aviation Administration.
Series: Advisory circular -- AC no. 20-133.
Publisher: U.S. Dept. of Transportation, Federal Aviation Administration
Published: 1989
Place of publication: [Washington, D.C.]
Language: eng
Number of pages: 17
Subjects: Airplanes -- Cockpits.; Air traffic control -- Communication systems.
Notes: Caption title.

Shipping list no.: 89-348-P.

"3/22/89."