Narrative:

I was observing the execution and helping set-up for [routine] checks. I printed all aircraft maintenance manual (amm) tasks associated with a pitot static leak check. Another mechanic pulled all circuit breakers having to do with the far check; and I double checked; and they were all pulled and tagged according to the task. [Another technician] and I followed the amm task step by step to set up the test equipment; pitot probes were not hot at this time. Aircraft was artificially weight-off-wheels at this time. Once set up was complete we followed the amm task for the leak test; starting with airspeed; test was good. Then after a return to ground we started with altitude. I went to the cockpit; in the doorway; to observe the climb on EICAS. I came back to the test equipment where [another technician] was because the system wasn't reading correctly. We attempted a return to ground from the test equipment; but it would not move. The test equipment was manually shut off and turned back on. Equipment read normal at this time. I went back to the cockpit; standing at the doorway; again to observe the climb while [another technician] ran the altitude part of the leak test again. As I was standing there another mechanic came in to check the circuit breakers. I came out of the plane to see what was happening and found out the test probes had melted to the pitot probes. Stand by probe was not affected. I was asked to again check the circuit breakers; all were still pulled at this time. Pitot probes (left and right) were then changed for new ones; and the test run again.

Related reports:

Google
 

Original NASA ASRS Text

Title: Maintenance Personnel reported that when they were testing the Pitot/Static system on a Bombardier CRJ; they did not deactivate the anti-ice heater properly.

Narrative: I was observing the execution and helping set-up for [routine] checks. I printed all Aircraft Maintenance Manual (AMM) tasks associated with a Pitot Static leak check. Another mechanic pulled all circuit breakers having to do with the FAR check; and I double checked; and they were all pulled and tagged according to the task. [Another Technician] and I followed the AMM task step by step to set up the test equipment; Pitot probes were not hot at this time. Aircraft was artificially weight-off-wheels at this time. Once set up was complete we followed the AMM task for the leak test; starting with airspeed; test was good. Then after a return to ground we started with Altitude. I went to the cockpit; in the doorway; to observe the climb on EICAS. I came back to the test equipment where [Another Technician] was because the system wasn't reading correctly. We attempted a return to ground from the test equipment; but it would not move. The test equipment was manually shut off and turned back on. Equipment read normal at this time. I went back to the cockpit; standing at the doorway; again to observe the climb while [Another Technician] ran the Altitude part of the leak test again. As I was standing there another mechanic came in to check the circuit breakers. I came out of the plane to see what was happening and found out the test probes had melted to the Pitot probes. Stand by probe was not affected. I was asked to again check the circuit breakers; all were still pulled at this time. Pitot probes (left and right) were then changed for new ones; and the test run again.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.