JAR 25A1141 APU controls: general
Each APU control must be located, arranged
and designed to meet the objectives of JAR
25.777 through JAR 25.781 and marked in
accordance with JAR 25.1555. In addition, it must
meet the following requirements:
(a) Each control must be located so that it
cannot be inadvertently operated by persons
entering, leaving, or moving normally in the
cockpit.
(b) Each flexible control must be approved
or must be shown to be suitable for the particular
application.
(c) Each control must have sufficient
strength and rigidity to withstand operating loads
without failure and without excessive deflection.
(d) Each control must be able to maintain any
set position without constant attention by flight-crew
members and without creep due to control
loads or vibration.
(f) Control valves –
(1) For manual valves, positive stops
or, in the case of fuel valves, suitable index
provisions in the open and closed positions.
(2) In the case of valves controlled
from the cockpit other than by mechanical
means, where the correct functioning of such a
valve is essential for the safe operation of the
aeroplane, a valve position indicator which
senses directly that the valve has attained the
position selected must be provided, unless
other indications in the cockpit give the flight
crew a clear indication that the valve has
moved to the selected position. A continuous
indicator need not be provided.
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