B737 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 143; Flight Crew Total 5286; Flight Crew Type 5286
Aircraft Equipment Problem Less Severe; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter CFTT / CFIT; Inflight Event / Encounter Unstabilized Approach; Inflight Event / Encounter Weather / Turbulence
Flight Crew Became Reoriented; Flight Crew FLC Overrode Automation; Flight Crew Overcame Equipment Problem; Flight Crew Regained Aircraft Control
Aircraft; Weather
While on approach ILS XX into ZZZ; we got a report of severe turbulence from aircraft ahead of us; a smaller business jet. They immediately restated it as moderate so we continued on approach and gave the PA for the flight attendants to be seated immediately. We then around 8000+ ft. MSL did in fact encounter the moderate turbulence which knocked the autopilot off and we then lost FD guidance as well. The Captain was Flying Pilot and I was Pilot Monitoring. He started to reach up and reengage MCP and I told him I'd get it and that we were now flying raw data. We got low on glideslope so I pointed this out and he pitched up to get back on path. Meanwhile I reengaged approach mode and he continued to hand fly as we we're approaching 1;400 ft. AGL. The Captain was also now trying to get aircraft configured as it just didn't want to slow down. He called for flaps 30 but we got a gust so I waited. Flaps 30 was set about 1;100; he then called for flaps 40 landing checklist; but again speed was a few kts. high. We got the 1;000 ft. call and set missed approach altitude and then I set flaps 40 and completed landing checklist at about 800 ft. AGL. We were drifting right of course and the FD finally came back up but didn't make sense so [we] were about to go around when we broke out about 500-600 ft. AGL and saw Runway XX to our left. I pointed it out; the Captain saw it and I said to land. He pointed nose down and made a nice landing and we exited A2 taxiway. We did get a soft glide slope warning just before landing to which the Captain responded with correcting with slight pitch up.We debriefed what we could before opening the door. In hind sight; there may have been a few spots where we might have gone around but in trying to regain our combined SA (Situational Awareness) and due to fact that there was moderate turbulence; high terrain ahead with IMC conditions and worry of loss of guidance; landing with the runway in sight seemed to be the safest course of action at that moment.We debriefed what we could before opening the door.  In hind sight; there may have been a few spots where we might have gone around but in trying to regain our combined SA and due to fact that there was moderate turbulence; high terrain ahead with IMC conditions and worry of loss of guidance; landing with the runway in sight seemed to be the safest course of action at that moment.
B737 Captain reported the autopilot disengaged and flight director guidance was lost after the aircraft encountered moderate turbulence during an ILS approach in IMC.