FLIGHT MANUAL BO 105 CB-5/CBS-5
EUROCOPTER
5 - 8
LBA APPROVED
Rev. 0
5.2.2 Engine Trend Check
NOTE The engine trend check is not an alternate procedure to the power assurance
check. Only the results of the Power Assurance Check (see Para 5.2.1) shall be
used to ensure that the engines are capable of developing the power necessary
to meet the presented performance data.
The engine trend check is provided for the purpose of monitoring the long-term behaviour
and recognizing sudden significant trend-line deviations of the engine performance at
minimum operator expense. This check, which should be repeated on a regular basis
based upon operator experience, is performed in cruise flight with both engines operating;
each engine being checked separately, in turn. The 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.
1. Note altimeter pressure setting; set for pressure altitude (29.92 in. Hg or 1013 hPa).
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
) or more.
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 consumption as much as possible.
5. Set N
2
at 100%.
6. Adjust collective lever as necessary to achieve an indicated torque of 86% or an indi-
cated TOT of 779 °C, whichever is reached first.
NOTE If N
1
is not at least 95%, the engine bleed valve is open and the check result is
not valid. In this case the check altitude should be increased.
7. Allow check engine to stabilize at the adjusted power setting for at least 1 minute.
8. Record the following values (avoid parallax errors):
– Pressure Altitude (FT)
– Outside Air Temp (°C)
– Torque (%)
– TOT (°C)
–N
1
(%)
– Engine Anti-icing (on or off)
9. Repeat above steps 4. through 8. to check other engine.
Rev. 1
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