S10, -V Service Bulletin Air Brake Control

October 9, 2000

Action 1: At higher airspeeds near VNE there may be fluttering in the upper covering straps on the air brake (air brake cover). The two mounting bolts (eye bolts) of the air brake have a significant effect upon this behaviour.

Action 2: A low locking force of the air brake covers may also favour fluttering. To ensure the necessary locking force the air brake sheets must not touch the bottom of the GFRP air brake box.

Action 3: In one case, fluttering on one side of the right air brake cover led to a side slipping condition (yawing), whereupon the LH L/G door opened and tore off. The L/G door that was torn off damaged the horizontal stabiliser. The tearing was possibly favoured by L/G door hinges that were already damaged.

Action 4: For the model S10-VT the L/G door actuation which prevents the opening of the LH L/G door has been redesigned. This re-design may be retrofitted for models S10 and S10-V.

Serial Numbers:
Action 1: 
   S10: 10-03 through 10-63 if they are still equipped with 12TI-DB
   S10-V: 14-002 through 14-030 and 14-012M through 14-063M if equipped with 12TI-DB

Action 2+3:
   S10: 10-03 through 10-63
   S10-V: 14-002 through 14-030 and 14-012M through 14-063M

Action 4:
   S10: 10-12 and subsequent
   S10-V: 14-002 and subsequent, and 14-012M and subsequent