BHT-206A/B-SERIES-MM-1
5-00-00
30 APR 2013 Rev. 14 Page 69
Export Classification C, ECCN EAR99
Chapter 28
Rolls-Royce 250
Series Operation and
Maintenance Manual
5W2 or 10W2
When purging airframe fuel filter and the engine fuel
system of air, ensure that both fuel boost pumps are
ON and motor engine for approximately 15 seconds
or until there is no evidence of air coming from fuel
supply hose. In addition, depress the airframe fuel
filter bypass indicator button during the motoring
operation to remove air more rapidly.
2. Purge the engine fuel system per the Rolls-Royce engine
fuel system purging procedure.
BHT-206A-FM-1,
BHT-206B-FM-1,
BHT-206B3-FM-1
3. During ground run, operate helicopter at 100% N
2
for
minimum of 2 minutes to ensure remaining air is purged from
fuel filter head and to check for fuel leaks.
Chapter 28 FUEL PUMP
This inspection is only applicable to helicopters S/N 4
through 3566 prior to incorporation of TB 206-82-75.
1. Check engine driven fuel pump filter impending bypass
function as follows:
a. Disconnect the fuel hose from forward end of differential
pressure switch and plug the hose.
b. Turn ON both fuel boost pumps and verify if engine
FUEL FILTER caution light illuminates.
c. If the engine FUEL FILTER caution light illuminates,
turn OFF both fuel boost pumps. Remove the plug and
reconnect the fuel hose removed in step a.
d. If the engine FUEL FILTER caution light does not
illuminate, troubleshoot and correct impending bypass caution
system.
5-23. 300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 3 (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER
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