B737 flight crew reported a bird strike on approach resulted in the failure of the First Officer's airspeed indicator.
Synopsis
B737 flight crew reported a bird strike on approach resulted in the failure of the First Officer's airspeed indicator.
Narrative
As we were on approach on landing runway XX in ZZZ I was pilot monitoring the first officer was flying. As I was looking at the runway; I saw a flock of birds come at us; and then saw and heard the birds hit the airplane. One of the birds hit the right side; which of the time I thought was the pitot tubes because almost instantly the first officer side air speed indicator became unreliable and the stick shaker started to go off. Because of the commotion we got a little bit above the glide slope so we elected to go around. I was able to see that the first officer was the unreliable side and mine was working as I matched it with a standby airspeed indicator. Shortly after the go round was initiated; I took control of the airplane since my side was working. We ran the immediate action items for unreliable air speed; and then as I was flying; the first officer; ran the checklist. The first officer altitude was also unreliable. Because of an earlier reroute; we had about 4500 pounds of fuel on board; and with the stick shaker still going off I didn't want to take too long running checklist so we elected to start back for the airport while the first officer was still running the checklist. We came back around and landed uneventfully. After looking at plane after landing; it appeared that the right angle of attack indicator was removed from the airplane by the bird strike. We wrote up the issue and contact the maintenance; I called the Chief Pilot for the debrief.
Second reporter narrative
Operating Aircraft X from ZZZ1 to ZZZ was uneventful for most of the flight. We received an ATC reroute that elongated our flight due to arrival route closures at ZZZ.We conducted a routine ILS approach to Runway XX with all checklists and airplane configuration done per company SOP; the FO was pilot flying with the automation disconnected. At about 400ft the FO saw a quick moving object on his side followed by a sudden thump. It was immediately clear we were hit by at least one bird. Almost immediately the FO's side PFD (Primary Flight Display) indications because unreliable; both overspeed and underspeed indications closed in and the stick shaker activated. The airplane was flying fine however due to the startle effect it and lack of indications on the PF side we started getting high on the PAPIs. The FO called a go around and initiated the maneuver. The Captain quickly noticed his side readings match our standby instruments and took control of the aircraft. We communicated the go around and the reason to ZZZ Tower and received vectors to head south of the airport. We conducted the unreliable airspeed memory items and continued to the QRH portion of the checklist. It became clear that due to the reroutes our fuel may become an issue (was at 5200lbs when we went around). We did not declare an emergency as we gathered the airplane is performing normally and the Captain side indications are accurate and reliable. We did ask ATC to vector us back to ZZZ as soon as practicable to avoid getting into a minimum fuel situation. They obliged and we landed a few minutes after the go-around was initiated. Postflight the FO conducted a visual inspection of the aircraft to survey the damage. Blood splatter was observed behind the FO AOA Vane; which was completely missing from the aircraft. Hub maintenance was contacted; Chief Pilot notified.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.