The manual describes the processes for trained technicians to maintain Hawker
®
sealed lead acid batteries as defined
in appendix A, and covers their basic design features, maintenance, storage, transportation and ultimately the disposal
requirements of the battery.
Only trained staff should have access to the manual, which always shall be of latest revision and kept in good condition
by the battery owner.
The Hawker
®
battery is a valve regulated lead acid (VRLA)
system, using absorbed glass mat (AGM) to retain the
electrolyte. The battery operates on the principle of gas
recombination resulting in minimal gas evolution during
normal operation. The battery is fully compatible for use
on aircraft, which may perform aerobatic manoeuvres.
The battery is maintenance free with respect to electrolyte
replenishment. Under no circumstances should any
attempt be made to interfere with construction or
introduce any substances, e.g. acid, distilled water or
alkali, to the battery.
The Hawker
®
24 volt aircraft battery covered by this
maintenance manual consist of two 12 volt valve
regulated monoblocs connected in series, enclosed in a
polyester bonded fibreglass case which incorporates the
battery main terminal connector. The monobloc design
is based upon a Thin Plate Pure Lead (TPPL), valve
regulated, lead acid system.
Each 12 volt monobloc consists of six 2 volt cells
internally connected in series to make a 12 volt block.
The individual 2 volt cells are not replaceable. The cells
within the monoblocs are interconnected with through-
the-partition-wall weld connections.
The cells are manufactured with proprietary VRLA AGM
technology that can deliver high performance engine start
capability in excess of 50C
1
amps at normal temperature
and superb durability under emergency load conditions.
Thin fiberglass separators are placed between the
positive and negative plates. The tightly packed
plates and separator form a compressed and rugged
construction, which enhances the battery’s resilience to
vibration.
1.
SCOPE
4
2.
INTRODUCTION
3.
BATTERY DESCRIPTION
Summary of Contents for HAWKER 9250-0083
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