A B737-300's Transformer Rectifier (TR) #1 failed on approach and caused navigation anomalies. After landing a tire blew because the anti-skid was inoperative and the crew had to switch to emergency power to contact ATC.
Synopsis
A B737-300's Transformer Rectifier (TR) #1 failed on approach and caused navigation anomalies. After landing a tire blew because the anti-skid was inoperative and the crew had to switch to emergency power to contact ATC.
Narrative
During the interception of the LOC; we began to experience odd presentations such as LOC capture; then autopilot flying about one dot off center; then exiting LOC capture. We experienced several of these events that also included G/S and F/D abnormalities. Finally the Captain's F/D failed; the computer flag stayed in the ADI; and multiple system lights came on. We were in visual conditions with the runway in sight. The First Officer was flying a good approach and managing the gusty winds. My assessment was that we had normal hydraulics; the performance stopping margin was 630 ft with wet good braking; and maximum autobrakes. I made the judgment that if the airplane was on the ground before the 1000 ft marker; that we would have even more margin and coached the First Officer to accomplish that; which he did. We used light but constant braking; max reverse; and assured full speed brake deployment. We were slowed to 60 kts with half of the runway remaining; easily making the Bravo exit. I selected the standby power to battery to regain communications and used the DC volt meter to confirm we had lost TR1 (Transformer Rectifier) . The C/B was found popped at the gate by Maintenance; who also confirmed we had blown one tire. A much better decision would have been to go around; evaluate the situation; apply all checklist procedures; and land at an appropriate airport.
Second reporter narrative
After the final approach fix and starting down on the glideslope; we started getting strange problems with our flight directors. At some point the Captain lost his completely. We decided to continue. The runway was in sight outside 1000 feet. There was a large gusty crosswind with light rain. I was concentrating on just flying the airplane and making a safe approach to landing. At some point inside 1000 feet I heard a click and we had a bunch of lights pop up at us. At this point we were only maybe 600 feet off the ground. The Captain checked hydraulics/brakes; etc.; and said it was safe to continue. I noticed the anti-skid may also have failed. We landed safely well within the touchdown zone and brought it to a slow stop with half the runway still left. We pulled off as normal and realized as we taxied in that we had a blown tire on the left side.Once at the gate we saw that the TR1 breaker had popped; and once Maintenance came; could not be reset. We then ran the landing performance for anti-skid inoperative and realized we were not legal to land on the runway under those conditions.We landed with TR1 failed/no anti-skid and blew a tire.
More incidents for this aircraft family →
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.