ABNORMAL MODES OF
OPERATION
BATTERY OVERHEAT
If either nickel-cadmium main battery exceeds
the temperature value shown in Table 2-1, the
crew will be alerted in several different ways.
First, the Master Caution or Master Warning
annunciators, depending on battery tempera-
ture, will be activated. A corresponding CAS
message will be generated for a battery over-
heat. An amber “L or R BATT OVHT” message
will be displayed for battery temperature ex-
ceeding 60° C and a red message will be dis-
played if the battery temperature exceeds 70°
C. Also, if battery temperature exceeds 70°, a
red “L or R BATT OVHT” annunciator on the
CWP will illuminate and the corresponding
battery will be automatically switched OFF if
not already switched off by the crew. The bat-
tery temperature must be less than 60° C be-
fore it can again be turned on.
If the SUMRY or ELEC system schematic is
being displayed on the EICAS or MFD dis-
plays, the digital readout of the battery tem-
perature for the affected battery will change
color. If the battery temperature exceeds 60°
C (140° F) the digital battery temperature dis-
play will change from white to a boxed amber
and if the temperature exceeds 70° C (160° F)
it will change to boxed red.
The Flight Manual procedure for this mal-
function is rather simple. Confirm the battery
temperature on the SUMRY or ELEC system
schematic and turn the affected battery OFF,
if not already off. If the temperature is ex-
ceeding 60° C and continuing to rise, land as
soon as practical. If the temperature is ex-
ceeding 70° C and is not decreasing, land as
soon as possible.
LEARJET 45 PILOT TRAINING MANUAL
2-33
FOR TRAINING PURPOSES ONLY
FlightSafety
international
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