B767 flight crew reported a suspected compressor stall in right engine during descent from cruise.

Attributes
ACN	1698550
Time
Date	201911
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZZ.Airport
State Reference	FO
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	Other Controlled
Flight Plan	IFR
Component
Aircraft Component	Compressor
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Experience	Flight Crew Last 90 Days 117 Flight Crew Total 6500 Flight Crew Type 1915
Person 2
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

Prior to descending from FL350 the vibration indicator on the right engine was fluctuating from 2.0 - 5.0 on the lpt. All other engine indicators were normal. We were given a descent from FL350 and upon the power coming back to idle there was a loud bang and aircraft shudder. I saw the vib on the right eng was at 5.0 but all other instruments were indicating normal. On a subsequent descent from FL220 we observed a second bang from the engine and began to suspect a compressor stall. I was the PF; the captain; the pm; began running the compressor stall checklist from the QRH and followed all of the procedures. We elected to conduct a 20 flap landing; leaving the right engine at idle in accordance with QRH procedures. Once the appropriate checklists were run aircraft control was transferred to the captain for an uneventful landing. After waiting three minutes after landing; and observing the lpt vib still at 5.0; we shutdown the right engine and continued to taxi to park.

Original NASA ASRS Text

Title: B767 flight crew reported a suspected compressor stall in right engine during descent from cruise.

Narrative: Prior to descending from FL350 the vibration indicator on the right engine was fluctuating from 2.0 - 5.0 on the LPT. All other engine indicators were normal. We were given a descent from FL350 and upon the power coming back to idle there was a loud bang and aircraft shudder. I saw the VIB on the Right Eng was at 5.0 but all other instruments were indicating normal. On a subsequent descent from FL220 we observed a second bang from the engine and began to suspect a compressor stall. I was the PF; the Captain; the PM; began running the compressor stall checklist from the QRH and followed all of the procedures. We elected to conduct a 20 flap landing; leaving the right engine at idle IAW QRH procedures. Once the appropriate checklists were run aircraft control was transferred to the Captain for an uneventful landing. After waiting three minutes after landing; and observing the LPT VIB still at 5.0; we shutdown the right engine and continued to taxi to park.

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.