<< >> NASA ASRS Report 1512583, January 2018

Twin cessna pilot reported a temporary loss of control on approach due to distraction from a fluctuating engine.

Attributes
ACN	1512583
Time
Date	201801
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Cessna 402/402C/B379 Businessliner/Utiliner
Operating Under FAR Part	Part 135
Flight Phase	Landing
Flight Plan	IFR
Component
Aircraft Component	Engine
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Commercial
Events
Anomaly	Aircraft Equipment Problem Less Severe Inflight Event / Encounter Loss Of Aircraft Control

Narrative:

On approach to landing; as I was turning base to final; the left engine began surging; with the RPM and manifold pressure both fluctuating by 300-400 RPM; this diverted my attention causing me to lose temporary control of the aircraft. I reverted to my training; [advised ATC] and instantly initiated a go-around once I regained control of the aircraft. I still had partial engine power; so I elected not to shut down the engine in-flight. I continued to make right traffic and then landed the aircraft on runway.

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Original NASA ASRS Text

Title: Twin Cessna pilot reported a temporary loss of control on approach due to distraction from a fluctuating engine.

Narrative: On approach to landing; as I was turning base to final; the left engine began surging; with the RPM and Manifold Pressure both fluctuating by 300-400 RPM; this diverted my attention causing me to lose temporary control of the aircraft. I reverted to my training; [advised ATC] and instantly initiated a go-around once I regained control of the aircraft. I still had partial engine power; so I elected not to shut down the engine in-flight. I continued to make right traffic and then landed the aircraft on runway.

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.