A Line Mechanic reported cross wiring the left main landing gear (MLG) anti-skid inboard and outboard wheel speed transducers during a field trip on a DeHavilland Q400. Approximately three days later; the #2 main tire blew on landing due to an anti-skid issue.
Synopsis
A Line Mechanic reported cross wiring the left main landing gear (MLG) anti-skid inboard and outboard wheel speed transducers during a field trip on a DeHavilland Q400. Approximately three days later; the #2 main tire blew on landing due to an anti-skid issue.
Narrative
First Officer found #1 [main] wheel smoking with evidence of metal fragments during post flight walk around. This occurred on the ZZZ ramp due to a possible #1 wheel bearing failure. Mechanic X and I were dispatched to repair the DeHavilland Q400. We removed and replaced both #1 and #2 main landing gear (MLG) tire and wheel assembly; both brake assemblies; both wheel speed transducers; and the left main axle.Upon arriving at work; I learned the same aircraft was involved in a #2 tire blow out in ZZZ1 three days later due to an anti-skid issue. I looked in maintenance documents to read the defect report and learned the #1 and #2 speed transducers cannon plugs were swapped and installed incorrectly.I told my Lead Mechanic; Supervisor; and Station Manager what happened and showed them in the aircraft maintenance manual (AMM) task what we did and how the AMM task is misleading. I told them the written steps were so easy and only dealing with two wires; Mechanic X and I read the steps and performed the job without looking forward in the task [procedures] at the illustrations (figures).The AMM tasks are very easy to accomplish; but they are also very easily deceiving by their lack of connection between the written steps and the illustrations. Removal task 32-11-04; step 4-A; note; says to tag the wires before unpinning them from the [cannon plug] connector. There is no reference to tag them specific to either #1 or #2 side [MLG inboard/outboard]. Figure 403; sheet-1 does show the wires to be specific in configuration. If the written step above said; 'Reference figure 403 for correct wire configuration tagging;' we never would have made this mistake. The same language misconnection occurs for the installation task 32-11-04; step 4-A; note and figure 404; sheet-1.
NASA callback
Reporter stated that was the first time that he and his coworker had unpinned speed transducer cannon plug wires. But since there were only two electrical wires for each speed transducer connector (white wire to pin 'A' and blue wire for pin 'B') they just never thought to tag them. Because they did not tag the wires; they managed to cross the left main landing gear (MLG) outboard blue wire with the inboard blue wire.Approximately three days later; as a result of the mis-wiring of the speed transducers; the #2 main tire (left MLG) blew on landing due to crossed anti-skid signals.Reporter stated they did perform an anti-skid test with a portable test unit after the re-pinning of the speed transducer cannon plugs; but since that was the first time either of them had used the test equipment they were not sure if they had performed the test correctly. If a Maintenance 'note' was inserted in the maintenance manual just prior to re-pinning of the inboard /outboard transducer cannon plugs instead of at the end; they would most likely have caught their re-pinning mistake. The Q400 does not have individual anti-skid indicators in the cockpit; only a 'caution' light on the annunciator panel above the glare shield and an anti-skid switch on the glare shield.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.