B1C17L1011
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Posts: 96
Joined: Fri Jun 29, 2001 12:42 am

Hawai'i DC-9 Aerilon

Fri Aug 31, 2001 12:38 am

I was recently on a Hawaian Air DC-9-50 out of Maui bound for the big island (Hawai'i). After we pushed back from the gate and headed for the runway I noticed that the right lowspeed aerolon, which is the only set on a DC-9, was in the up position. Additionally I did not notice the flight crew performing the usual control crosscheck by cycling the yoke. As we approached the runway the right aerolon remained in the full up position. It this point I was slightly unnerved because I know what would happen if it became stuck. As we began our take-off run and built up speed the aerolion slowly moved back to the neutral position as the airflow increased. I have never seen this happen before, is this normal or a potentially serious problem.

Regards
B1C17
 
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DL_Mech
Posts: 2387
Joined: Fri Feb 18, 2000 7:48 am

RE: Hawai'i DC-9 Aerilon

Fri Aug 31, 2001 4:39 am

DC-9 flight controls (ailerons, elevators) are operated by control tabs that are located on the trailing edge of surface itself. The tab moves in opposite direction of the desired surface movement in order to move that flight control. If the pilots did a flight control check, you would have seen only the tab move, as there was not sufficient airflow across the aileron to move the entire aileron.
This plane is built to withstand anything... except a bad pilot.
 
242
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Joined: Tue Oct 24, 2000 1:10 pm

RE: Hawai'i DC-9 Aerilon

Fri Aug 31, 2001 3:02 pm

It's normal. DL_Mech described the DC-9 (or MD-80) ailerons correctly. Standing below it on the ground, you can move it full travel up or down with your hand. The only resistance you'll feel is the damper unit.
 
Archie Bunker
Posts: 359
Joined: Thu Jul 06, 2000 3:22 am

RE: Hawai'i DC-9 Aerilon

Fri Aug 31, 2001 3:18 pm

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