B767 flight crew reported sluggish flight controls on approach resulted from a missing main landing gear door and a hydraulic fluid leak.
Synopsis
B767 flight crew reported sluggish flight controls on approach resulted from a missing main landing gear door and a hydraulic fluid leak.
Narrative
After landing in ZZZ on taxi in we noticed center hydraulic system RF on the status page. Upon parking the maintenance staff advised us we are missing a gear door and losing hydraulic fluid from the right main gear. We advised the maintenance that we needed to call the tower in case it was on the runway. Maintenance said they had already called to inform them; and airport operations was going to check. Airport operations showed up and said they had drove the runway and looked at the area near the runway without locating the door at the time we left the airport. The Airport Fire Department also responded to our location on the Company ramp for safety. The Captain/Check Pilot spoke with them for the information they needed. The approach into ZZZ ATC had held us high and at one point canceled our approach clearance having us level off due to VFR traffic. This resulted in us needing to configure on speed and drop the gear to slow to allow us to select flaps 15. Once one final and stabilized everything looked normal. We completed the landing check list. Stable call at 1000 ft. as normal. At some point on final the Captain/Check Pilot who pilot flying was asked something to the effect of it was always like this coming in here. I said yes attributing the extra work he was doing hand flying to normal thermals in the area; and everything looked normal to me. At around 300 ft. he made an additional comment relating to how it was flying. However; we were on the LOC/GS and at our just a couple of kts. over bugged speed so I just assumed it was related to all the corrections needed to keep us stable. The landing felt/looked similar to the last auto land I had done into ZZZ. After landing at some point he made the comment the controls felt less responsive then normal. Additionally and most likely unrelated while in the decent/level offs from ATC the auto throttles went to max power with N1 Flight Mode Annunciator (FMA) displayed that resulted in disconnecting the auto throttles and then re automating. Also check pilots ID number was entered wrong in the preflight data in ACARS.
Second reporter narrative
Upon landing at ZZZ I was advised by maintenance that there was a hydraulic leak and parts of the landing gear door were missing. The only indication there was something wrong was a center hydraulic system cyan RF. went to inspect the damage and as described there was a very bad hydraulic leak on the right landing gear and lower part of the gear door was missing as well as the upper part of the door broken; the upper/bonded swivel points were still on the airplane however both of the lower/fixed attachment points (bolts) were missing. The lower point bushing was horizontally elongated; no other damage was noticed on the flaps which were retracted at this point. On the approach we were held above profile and in order to catch up I extend the landing gear as well as flaps 15 at about 210 kts. and several times during the final phase of the approach I have noticed aircraft feeling sluggish on the controls. We made a successful landing slightly to the left of centerline that I do not believe was outside of the normal parameters. Airport operations conducted a runway sweep and no parts were found that I am aware. I do not know why the gear door fell off and in the process of severing itself from the aircraft severed the hydraulic lines. Aircraft was operated within the limitations I believe; when the airplane was feeling sluggish executing a go around however the approach was within the stable criteria and I was attributing sluggish control to thermal activity.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.