CSP-HMI-3MD Helicopters, Inc.
MAINTENANCE MANUAL
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96-05-00
Page 203
Revision 8
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Neither this document nor any part hereof may be reproduced or transferred to
other documents or used or disclosed to others for manufacturing or any other
purpose except as specifically authorized in writing by MD Helicopters, Inc.
Copyright © 1999−2016 by MD Helicopters, Inc.
5. Battery Servicing Procedure
Consumable Materials
(Ref. Section 91−00−00)
Item Nomenclature
N/A Distilled water
Battery servicing consists of replenishing any
electrolyte water that may have been lost
through normal gassing, venting or overcharg
ing. Lost water should be replaced with pure
distilled water only. Never use potassium
hydroxide solution.
Electrolyte level should be
checked only after battery has
been fully charged and then allowed to rest
(stand idle) for a period of 1 - 2 hours. If he
licopter is operated continuously for mini
mum of 1 hour or more, battery may be con
sidered fully charged.
(1). Set master switch at OFF.
(2). Raise pilot compartment floor left
access door and remove battery cover.
Use care to avoid damaging bat
tery temperature-sensing wires
and switch connections during cleaning and
servicing.
(3). Wipe tops of cells with clean cloth and
remove filler vent caps.
(4). Check electrolyte level in each cell
according to battery manufacturer's
instructions (Ref. Sec. 01-00-00).
Do not add distilled water if bat
tery has remained idle for more
than 2 hours after flight (charging). Electro
lyte level will drop in a longer time interval
and any added water would result in over
filling.
NOTE: If electrolyte level is low to extent that
it is not visible, remove battery from heli
copter for bench charging and servicing.
(5). Using thoroughly clean bulb-type
syringe that has never been used for
servicing a lead-acid battery, add pure
distilled water as necessary to raise
electrolyte 1/4 - 3/8 inch (6.35 - 9.525
mm) above plates. If there is surplus
electrolyte, replace battery; or, remove
battery and service in accordance with
battery manufacturer's instructions.
NOTE: If battery with surplus electrolyte is
serviced, it must be checked for serviceabili
ty according to battery manufacturer's in
structions before reinstallation and reuse in
helicopter.
(6). Reinstall filler vent caps.
(7). Reinstall battery cover, mounting
screws and washers; close and latch
access door.
6. Battery Charging
Consumable Materials
(Ref. Section 91−00−00)
Item Nomenclature
N/A Distilled water
Nickel-cadmium battery charging is accom
plished by either normal charging method or
deep-cycling method, depending upon circums
tances.
Normal battery charging consists of charging
battery by constant-potential method or
constant-current method and adjusting
electrolyte level if required. Normal battery
charging is accomplished when need arises.
Deep cycling consists of intentionally discharg
ing and then recharging battery, adjusting
electrolyte level, checking battery output
capability (capacity discharge test) and again
recharging. Deep cycling should be accom
plished on a new battery before it is installed
in helicopter, if required and at inspection
intervals specified in Chapter 05. Deep cycling
should also be accomplished after battery
repairs such as replacement of individual cells
or battery case, and after any idle period of 90
days or more.
NOTE: Follow manufacturer's instructions for
battery charger; however, all voltage val
ues, discharge rates and charging schedules
given in following paragraphs shall apply in
event of conflict with constant-potential
battery charger instructions.
CAUTION
CAUTION
CAUTION
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