Learjet 60 Pilot’s Manual
PM-123 6-9
Change 6
STAB HT LIGHT
The amber STAB HT light, located on the glareshield annunciator panel
will illuminate when any of the following conditions exist:
On the ground
• STAB HEAT circuit breaker is pulled.
• STAB WING HEAT switch is On.
In flight
• STAB HEAT circuit breaker is pulled.
• The STAB WING HEAT switch is On and any one heating
element fails (remaining elements will continue to function
normally).
During flight, illumination of the STAB HT light indicates system fail-
ure. During ground operation, the STAB HT light should illuminate
whenever the STAB WING HEAT switch is On.
STABILIZER HEAT SELF TEST
A self test may be conducted with the aircraft on the ground and a gen-
erator on-line. Under these conditions, when the STAB WING HEAT
switch is turned on the following events should happen:
1. The STAB HT light will illuminate.
2. The generator load will increase approximately 120 amps total
for 2 to 3 seconds and then decrease to the “STAB HEAT off”
value.
3. The STAB HT light will remain illuminated indicating the sys-
tem is functioning normally.
The following events indicate a failure of the system:
1. STAB HT light does not illuminate when STAB WING HEAT
switch is turned on. Turn STAB WING HEAT switch off.
2. Load does not decrease within 5 seconds. Turn STAB WING
HEAT switch off.
3. STAB HT light flashes approximately 3 times per second. One
or more heating elements are not within their operating toler-
ance (element failure). Turning STAB WING HEAT switch off
will cancel the flashing.
The STAB WING HEAT switch must be off for 3 minutes allowing the
system to reset before another self test attempt can be made.
Change 6
To Next Page
Loading...
