The AW139 rotor brake system allows rapid deceleration of the rotor after engine shut down. The rotor brake is also designed to allow for parking the rotor for up to 8hrs. The rotor brake control logic only allows Rotor Brake operations with engines shut down as automatic removal of pressure and caliper travel DOWN are activated for any other conditions (ie. one engine in ground idle).
The Rotor Brake consists of disc type braking, operating lever, tubing and fittings required for the installation. The brake caliper is automatically disengaged from the disc when the engines are running in flight mode. The caliper automatically engages with the disc when the aircraft is on the ground and the engines are shut down.
The rotor brake operation is indicated by activation of the ROTOR BRAKE ON advisory message on the CAS. Malfunctions of the system are indicated by caution messages on the CAS.
The complete Flight Operations Manual for the AW139 is available on
avialogs.com. You can view individual pages for free. Against a once off fee of USD 10 you can download the full manual in pdf format (25 MB), and any other manuals available from the Avialogs archives.