EUROCOPTER
FLIGHT MANUAL BO 105 CB-5/CBS-5
5 - 3
LBA APPROVED
Rev. 0
5.2 INFLIGHT POWER CHECKS
The power assurance check is provided to ensure that the engines are capable of devel-
oping the power used in establishing the performance data presented in this manual.
The engine trend check is provided to periodically monitor the long-term engine behavior.
5.2.1 Power Assurance Check
This check is performed in cruise flight with one engine operating at IDLE; each engine
being checked separately, in turn. The generator and non-essential bleed air consumers
(if installed) of the check engine must be switched off during its check. Engine anti-icing
shall be on if ambient conditions require its use.
The power assurance check must be performed at intervals not to exceed 100 flight hours
or whenever abnormal engine function is noted.
1. Note altimeter pressure setting; set for pressure altitude (29.92 in. Hg or 1013 hPa).
WARNING MAINTAIN A SUITABLE MINIMUM SAFE HEIGHT IN CASE OF ENGINE
FAILURE.
2. Select a convenient pressure altitude in increments of 1000 ft from sea level up to the
maximum check altitude of 10,000 ft. Establish and maintain level flight with 60 KIAS
(V
Y
).
WARNING SYSTEMS OR COMPONENTS REQUIRED FOR SAFE FLIGHT SHALL
REMAIN ON.
3. Switch off all non-essential bleed air consumers. If engine anti-icing is frequently re-
quired for safe flight, it should be operated during each power check.
4. Reduce electrical load as much as possible.
5. Switch off generator of the engine to be checked.
6. Set power lever of non-check engine slowly to IDLE.
NOTE Observe limits (N
1
, TOT, Torque) of check engine.
7. Set N
2
/N
RO
to 100%.
WARNING DO NOT EXCEED ENGINE OR HELICOPTER LIMITS.
8. Adjust collective lever as necessary to achieve an indicated torque of 95% or an indi-
cated TOT of 810 °C, whichever is reached first. Adjust airspeed as necessary to
maintain level flight.
9. Allow check engine to stabilize at the adjusted power setting for at least 1 minute.
Rev. 1
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