Date: 202001
Local time of day: 0001-0600
Location: ZZZ.TRACON, US
Aircraft: B767-200
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Cargo / Freight / Delivery
Flight phase: Initial Approach
Aircraft component: DC Ram Air Turbine
Component problem: Malfunctioning
Reporter organization: Air Carrier
Reporter function: Pilot Not Flying; First Officer
Reporter qualification: Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Human factors: Troubleshooting
Anomaly: Aircraft Equipment Problem Critical
Detector: Person Flight Crew
When detected: In-flight
Result: Air Traffic Control Provided Assistance; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Landed in Emergency Condition
Contributing factors: Aircraft
Primary problem: Aircraft

Narrative: The morning could be described as cold (temp in the teens F); with blowing snow out of the west. The airplane had been sitting on the ramp since the Captain and I brought it into ZZZ from ZZZ1. The Captain was the flying pilot and I was the pilot monitoring for this leg. There was a late push back due to delayed loading of cargo. It was a normal push back until there was an impending hot start on the right engine. No parameters were exceeded; and the fuel control switch was moved to cutoff. We waited until the EGT cooled back down and initiated another start. The Captain moved the igniters from 1 to both for the second attempt. We let the engine motor for 1 min to clear out any fuel and to ensure the EGT was cool enough. During the second attempt the right engine started as normal. There was a normal start on the left engine following the second start on the right engine. No other abnormalities occurred until the top of descent.We were given a crossing restriction and a decent via the ZZZZZ arrival. We were at FL 350 and already in the VNAV path; so the Captain set the altitude bug to 6;000 ft.; the final altitude over ZZZZZ. We then monitored the aircraft's progress until the airplane crossed the top of descent and began descending via the arrival. Once the engines were brought back via the auto throttles there was a loud bang and some vibrations in the airframe. The Captain asked Captain A; who was dead heading; to check the cargo to see if there was a shift in any of the containers. As the Captain was checking the cargo load; I was checking the paperwork to see if any open spots were noted. Captain A returned saying cargo was loaded in the front two spots and the paperwork confirmed that only the rear spot in the belly was void. The rest of the descent and arrival went without any other abnormalities; until the transition to approach.We were cleared direct ZZZZZ1 after ZZZZZ. The FMS was loaded and the LNAV followed the course. After crossing ZZZZZ at 6;000 ft.; we were cleared to 4;000 ft. We leveled at 4;000 ft. and then were cleared to cross ZZZZZ1 at or above 2;400 ft. cleared for the ILS XXL approach. The Captain selected 2;400 ft. on the altitude bug and armed the approach. Once the throttles were brought back via the autothrottles the banging and vibrations began again. This time they were continuous and more violent. The Captain disconnected the auto pilot and stated something was abnormal with the handling of the aircraft. He then [advised ATC] and headed direct for the runway. The Captain noted the large difference between the left and right engine indications although both throttles were matched in the flight deck. The Captain asked for the right engine to be shut down and the immediate action checklist severe engine damage. I grabbed the immediate action checklist card and began running the severe damage checklist. All three of use confirmed and shut down the right engine. After completion of the checklist all of our attention was focused on the approach and landing the aircraft. After landing and vacating the runway; emergency vehicles inspected the airplane and stated that the RAM air turbine was deployed; but no damage or fire was noted. After inspection; the Captain requested an after-landing flow and taxied back to the gate single engine. Upon arrival at the gate and engine shut down; a walk around of the airplane was conducted by all three pilots. No damage was detected; and the only abnormality was the RAT being deployed.Weather conditions on the arrival were fair. We experienced some light chop between 17;500 ft. and 15;500 ft. Weather conditions at the field were steady state winds around 10 kts. out of the northwest and good visibility.




Synopsis: B767 First Officer reported that the Ram Air Turbine deployed during descent; resulting in a loud bang and airframe vibrations.