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BE76 flight instructor reported the right engine throttle was ineffective when power was reduced. A VFR approach was made with the subsequent shutdown of both engines on short final.
| Attributes | |
| ACN | 1525638 |
| Time | |
| Date | 201803 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | Duchess 76 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Initial Approach |
| Component | |
| Aircraft Component | Throttle/Power Lever |
| Person 1 | |
| Function | Instructor Pilot Not Flying |
| Qualification | Flight Crew Commercial Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
My student and I were practicing single engine simulated approach on GPS RWY32 circle to 28; we crossed IAF at 2;000 feet and then I reduced the left throttle to start the simulation. My student started to practice the emergency procedure: maintain directional control and altitude; full mixture; full props; full power (right throttle); flaps up; gear up; auxiliary pumps on; identify and verify dead foot dead engine. He identified the dead engine was the left one so we put zero thrust and continue the maneuver. At this time everything was ok. Then we crossed the FAF. My student tried to decrease the manifold pressure of the good engine (right one) for start to descend then I realized that the manifold pressure in the right manifold pressure gauge did not decrease. I took the controls and I canceled the maneuver putting back the left prop and throttle. When I tried to decrease both throttles I saw that manifold pressure of the right engine did not decrease. I was talking with tower at this time to let them know that I am crossing zzzzz. They asked me if I wanted to take RWY32 or circle for runway 28. The conditions were VFR so I canceled the approach and started to align plane for landing on runway 28. I did not want to take any risk so I [advised ATC] in order to take any runway available in case the flight conditions were worst. My right engine was with full power due to the throttle level unable to control and I came with the left the engine on idle in order to maintain a safe and stable approach.at short final when I was sure about my landing and everything was safe with usable runway I killed both mixtures at the same time and feathered [both] of the engines thinking that also I am going to lose the mixture control levers and power control levers in both engines.I landed and vacated the runway in the protected area and shutdown the plane.
Original NASA ASRS Text
Title: BE76 flight instructor reported the right engine throttle was ineffective when power was reduced. A VFR approach was made with the subsequent shutdown of both engines on short final.
Narrative: My student and I were practicing single engine simulated approach on GPS RWY32 circle to 28; we crossed IAF at 2;000 feet and then I reduced the left throttle to start the simulation. My student started to practice the emergency procedure: Maintain directional control and Altitude; Full Mixture; Full Props; Full Power (right throttle); Flaps up; Gear up; auxiliary Pumps on; Identify and verify dead foot dead engine. He identified the dead engine was the left one so we put zero thrust and continue the maneuver. At this time everything was ok. Then we crossed the FAF. My student tried to decrease the manifold pressure of the good engine (right one) for start to descend then I realized that the manifold pressure in the Right Manifold pressure gauge did not decrease. I took the controls and I canceled the maneuver putting back the left prop and throttle. When I tried to decrease both throttles I saw that manifold pressure of the right engine did not decrease. I was talking with tower at this time to let them know that I am crossing ZZZZZ. They asked me if I wanted to take RWY32 or circle for RWY 28. The conditions were VFR so I canceled the approach and started to align plane for landing on RWY 28. I did not want to take any risk so I [advised ATC] in order to take any runway available in case the flight conditions were worst. My right engine was with full power due to the throttle level unable to control and I came with the left the engine on idle in order to maintain a safe and stable approach.At short final when I was sure about my landing and everything was safe with usable runway I killed both mixtures at the same time and feathered [both] of the engines thinking that also I am going to lose the mixture control levers and power control levers in both engines.I landed and vacated the runway in the protected area and shutdown the plane.
Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.