DOCUMENT NUMBER:
L500-912.820 ISSUE JUL 20, 2016
AMENDMENT: 00
DATE: 
CHAPTERPAGE 343
MAINTENANCE MANUAL STEMME S12
3.7.6.3 PROTECTION DEVICES
Fuses and circuit breakers of dierent industrial standards are used to protect each electrical
circuit. The protective devices are rated according to the maximum allowed electrical load of the
protected wire. Protection devices are located as close as possible to the voltage source to mini-
mize the length of unprotected wire.
Fuses are grouped in fuse holders at dierent locations at the aircraft. The fuse holders are not
reachable by the pilot in ight. Devices and circuits protected by fuse are considered as non-es-
sential to safe ight. The loss of the related function caused by a blown fuse will not cause haz-
ards to aircraft or crew. On the other hand, because of the fuse ratings there must be a severe
reason for a blown fuse. It is considered improbable, that this could be corrected by the pilot by
replacing a fuse in ight. A sucient number of spare fuses is provided with the on-board tool
set for a repair on ground.
The circuits of landing gear and electronic equipment are protected by resettable circuit breakers,
located on the instrument panel and easy to reach by the crew in ight. This enables the pilot to
evaluate the state of power supply of such devices in the case of malfunction. In addition, it allows
the pilot to deactivate certain devices during gliding ight to save battery power (load shedding).
Each circuit breaker is clearly labeled with its function.
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