Restrictions and Procedures: Lycoming O-320-D2J Engine (N739EU)

Objective

To ensure proper break-in of the newly installed Lycoming O-320-D2J engine in N739EU, the following restrictions and procedures must be adhered to for the first **25 hours** of operation.

 

Operating Restrictions

  1. Dual Instruction Only: No solo flights permitted.
  2. Cross-Country Flights Only:
    1. No local flights or pattern work.
    2. Extended cruise flight at proper power settings is required to facilitate cylinder wall conditioning.
    3. Given the cold weather, mixture leaning will not be necessary at lower altitudes.
  3. No Touch-and-Go Landings:
    1. Full-stop landings only to minimize thermal cycling.
  4. Mineral Oil Requirement:
    1. The aircraft will operate exclusively on **mineral oil** (non-detergent aviation oil) for the duration of the break-in period.
    2. The **25-hour limit cannot be exceeded** before switching to standard ashless dispersant oil.
  5. Flight Schedule and Reservation Rules:
    1. FSP reservations must be a **minimum of 3 hours**(strictly for cross-country flights).
    2. Any reservations shorter than 3 hours will be **canceled.**

 

Engine Break-In Flight Profile:

  1. Startup & Warm-Up:
    1. Conduct normal pre-flight checks and startup procedures.
    2. Allow oil temperature to reach at least 150°F before takeoff.
    3. Perform a short ground run-up to prevent excessive heat buildup.
  2. Initial Climb-Out:
    1. Use full power for takeoff.
    2. Maintain best rate-of-climb (Vy) or cruise climb for proper engine cooling.
  3. Cruise Phase:
    1. Operate the engine at 75% power for the majority of the flight.
    2. For the O-320-D2J, 75% power is approximately 2500 RPM at cruise altitude. Do not exceed 8000 feet density altitude (5000ft is recommended) Check your POH for specifics.
    3. Avoid extended periods of low power settings.
    4. Maintain oil temperature between 180°F – 200°F and oil pressure within normal operating limits.
  4. Descent & Landing:
    1. Reduce power gradually to prevent shock cooling. Plan your descents!
    2. Keep power as high as practical during descent. Avoid extended idle power descents.

 

Additional Notes:

  1. Avoid prolonged ground operations.
    1. Long taxiing or idle periods can lead to glazing of cylinder walls.
  2. Do not baby the engine.
    1. Running at high power ensures proper seating of piston rings.
  3. Monitor oil consumption.
    1. Expect higher than normal consumption during break-in.
  4. Report any abnormalities immediately.
    1. Look for signs of excessive oil burning, high CHTs, or unusual engine performance.

 

This procedure is essential to ensure the longevity and efficiency of the new engine. If you have any questions, please reach out before scheduling a flight.

 

Thank you for your cooperation!