Manual Mode Response Check | Airbus EC135 helicopter

In this 12 minutes we go through the Auto to Manual to Auto Mode Response check. That is 12 minutes of your life that you will never get back, but is worth watching. This response check is done during the 200 hour engine inspection and other inspections. We review the engine maintenance manual procedures for the Pratt and Whitney PWC 206B2 engines installed on an Airbus EC135, H135 helicopter.

This check is not complicated but there are a couple things to watch out for:

Specifically, the engine maintenance manual says to set the NG to 85%. NG is N1, look at the N1 displayed on the FLI.

Another thing that needs clarification is that the engine maintenance manual tells you to set the engine to "Flight Idle." Don't confuse this with "IDLE" for the engine selector switch. Pratt wants the aircraft to be at 100% Nr (rotor speed), so set the engine switch to "FLIGHT," and turn off the Cat A or High NR.

With the recent revision to the EMM (engine maintenance manual), the procedure now calls for BOTH engines to be at flight setting during this check. We review why this was changed from "have all other engines in shut down state."

Also, do not move the collective too much when the Selector switch is in Manual Mode. And DO NOT twist the throttle when in Manual Mode during this check.

We also go through why Pratt wants us to do this check in the first place. This is because dust clogs up the P3 air lines going to the Fuel Management Manual (FMM), and if it gets really bad, dust particles clog up the FMM's P3 input.

If the aircraft flies through dusty areas or lands near grassy areas (if you see grass in the intake screen), then the P3 air to the #8 Bearing seal housing and the FMM could be clogged. During the 200 hour engine inspection, we check for debris and airflow at the P3 fitting. If there is debris or there is insufficient air flow then the #8 bearing seal housing needs to be cleaned due to a build up of debris inside of the housing. If you see a little oil leaking out from the engine output drive seal then there is a good chance that the housing is filled with debris and needs to be cleaned.

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Regards,
-Helicopter Maintenance Help Desk

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