Table of Contents
Advertisement
Step 8. Break-In/Flight Test/50-Hour Operation
NOTICE: The "Break-In/Fight Test/50-Hour Operation" procedure and the "Required Inspections
During Break-In (50-Hour Operation)" must be completed any time new piston rings
are installed or any time one or more cylinders are replaced per procedures in Chapter
72-30 in the TEO-540-A1A Engine Maintenance Manual.
Engine break-in is done to seat the piston rings and stabilize oil consumption. Break-in includes two
progressive procedures:
• A flight test (done first)
• Operating at specified cruise powers (per Appendix A) for 50 hours or until oil
consumption stabilizes.
NOTICE: Refer to the latest revision of Service Instruction No. SI-1427 for any additional details.
An operational test and a pre-flight ground run-up must be done before approval by an authorized
inspector for a flight test. This flight test, which is part of the required engine break-in field
procedure, is necessary to make sure that the engine and aircraft are in compliance with all of the
manufacturer's performance and operational specifications before release of the aircraft for service.
WARNING REPLACE ENGINE TEST CLUBS WITH APPROVED FLIGHT
PROPELLERS BEFORE THE FLIGHT TEST.
DO NOT TAKE-OFF IF ANY OF THE FOLLOWING CONDITIONS ARE
FOUND:
• Engine roughness
• Low, high, or surging rpm or fluctuations • High manifold pressure
• High, low, or fluctuating oil pressure
1. Start the engine and complete a pre-flight run-up in accordance with the applicable
manufacturer's POH.
2. Complete a full power take-off in accordance with the POH.
3. Monitor the engine rpm, fuel flow, oil pressure, oil temperature and cylinder head
temperature during take-off.
4. As soon as possible, decrease to climb power in accordance with the POH.
5. Complete a shallow climb angle to a suitable cruise altitude.
WARNING DURING BREAK-IN, MAKE SURE THE ENGINE IS OPERATED AT
6. At cruise altitude, decrease power to approximately 75% and continue flight for 2 hours. For
the second hour, operate the engine at power settings alternating between 65% and 75%
power as per the applicable POH.
7. If the engine and aircraft are operating to specifications in Appendix A, increase engine
power to the maximum airframe recommended power and hold for 30 minutes.
Engine Initiation
Page 58
TEO-540-A1A Engine Installation and Operation Manual
65% OR MORE CRUISE POWER AS MUCH AS PRACTICAL TO
ENSURE CORRECT PISTON RING SEATING. ENGINE OPERATION
BELOW 65% CRUISE POWER AT ANY TIME DURING BREAK-IN
CAN RESULT IN INADEQUATE SEATING OF THE PISTON RINGS.
• High or low fuel flow
• Low battery charge.
© 2018 Avco Corporation. All Rights Reserved
October 2018
Advertisement
Table of Contents
