B767 crew reports standby attitude indicator failure enroute to Europe from America. Crew and dispatch agreed to divert to BOS for repairs.
Synopsis
B767 crew reports standby attitude indicator failure enroute to Europe from America. Crew and dispatch agreed to divert to BOS for repairs.
Narrative
At cruise standby attitude indicator failed. Contacted Dispatch and Maintenance. Could not continue ETOPS and did not want to continue IFR at night without standby attitude indicator. After determining that BOS had parts; staff to repair item and do ETOPS certification/overweight landing inspection; decided to divert to BOS. Dispatch advised 33L/15R (longest runway) was closed. BOS was landing 4R (more than 10;000 feet long). Descending into BOS ATC advised 4R now closed; 4L now landing runway due to ship in harbor. Did not want to land overweight on 4L (shorter runway) and worried about brake temp with braking needed to land on shorter runway. Took delaying vectors for about 8 minutes until 4R opened. Landing uneventful; highest brake temp reached was 3. Maintenance repaired standby attitude indicator; did overweight landing inspection and ETOPS certification. Got new release and departed. Excellent coordination by all departments. Landed at 328.9; max landing wt is 320.0. Felt over weight landing appropriate. Did not want to hold for an hour to get to landing weight at night in IFR conditions without standby attitude indicator and this was the safest course of action.
Second reporter narrative
I was in the bunk on rest period during cruise when I was called back to the cockpit because the standby attitude indicator gyro flag was displayed. The Captain and Co-pilot had talked to the necessary people and we prepared to land at BOS for repairs. Normal landing but overweight. At gate maintenance performed work and inspections and aircraft was released to fly.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.