Specifications

MODEL 560 SECTION II
AIRPLANE AND SYSTEMS
During thrust reverser deployment, the initial movement of the actuators activates the stow switches.
Either switch will cause the amber UNLOCK light to illuminate. Further movement of the actuator unlocks
the reverser through the overcenter linkage. The remaining travel of the actuators deploys the reverser
doors.
At full deployment of the reverser, the deploy switch is activated which in turn illuminates the white
DEPLOY light and unlocks the pedestal-mounted throttle lock-out cam. The purpose of the lock-out cam
is to prevent increasing engine thrust, once reverser deployment has been selected, until the reversers
have fully deployed.
Figure 2-5. Thrust Reverser Emergency Stow Switches and Indicator Lights
Three reverser indicator lights for each reverser are mounted on the cockpit glareshield for monitoring
reverse functions: ARM, UNLOCK and DEPLOY.
NOTE
The DEPLOY light shall illuminate in less than 1.5 seconds after the hydraulic
UNLOCK light illuminates. An erroneous sequencing or a delay in the illumination
of the thrust reverser lights indicates a failure in the thrust reverser system. Either
or both conditions requires a maintenance check.
WARNING
DO NOT ATTEMPT TO FLY THE AIRPLANE IF THE THRUST REVERSER
PREFLIGHT CHECK IS UNSUCCESSFUL.
As previously mentioned, landing gear squat switch on the reverser side must be activated to
complete the electrical circuit necessary to initiate deployment of the thrust reverser.
The thrust reverser lever(s) should not be placed in the idle reverse detent position in flight since a
single failure of a squat switch could permit deployment of the thrust reverser(s). If the thrust reverser
lever is placed in the idle reverse detent position while airborne, the airplane MASTER WARNING light
will flash along with illumination of the ARM and HYD PRESS annunciator lights. A MASTER WARNING
light, when thrust reversers are moved to deploy on the ground, means that a landing gear squat switch
has activated. To ensure actuation of the squat switches and to eliminate any delay in the deployment of
the thrust reversers, it is recommended that the speed brakes be extended immediately following
touchdown.
56OMB-01 Configuration AA 2-9