Regional Jet 900 (CRJ900)
Maintenance Airframe; Maintenance Powerplant
Situational Awareness; Training / Qualification
Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Aircraft Aircraft Damaged; General Maintenance Action
Human Factors
I was performing a functional test of the stall protection computer. On step XX; the task tells you to put the aircraft in the weight off wheels configuration. On the first page of the task for putting the aircraft in the weight off wheel configuration you are told to pull and tag Circuit Breakers (CB): CB P-1; A12; A13; A14; G14; & CB P-1 lower U7. On the second page to pull and tag CB P-1 lower T7; T8; T9; CB P2; N6; H8; CB P2 lower S1; V5 and CB P-5; B10.I pulled the circuit breaker on the first page but failed to pull the circuit breakers on the second page of the task. On the next step on the functional test of the stall protection computer you are told to set the air data test set to 90 kts and the altitude to 18;000 feet. During this step is when we noticed smoke coming from the left pitot probe. I ran out to check the pitot probe and saw that I melted the pitot probe test head to the pitot probe. I quickly removed heat from the pitot probe.To pay more attention to the Aircraft Maintenance Manual and to double check all the correct circuit breakers are pulled.
While performing a functional check of stall protection system we were required to put aircraft in weight off wheels and put aircraft at 18;000 feet and 90 kts using pitot static test set. During the test; the test head on the LH (Left Hand) pitot static probe was melted to the probe.While performing the test I looked up and saw smoke coming from LH side of nose.My partner found the task in the AMM (Aircraft Maintenance Manual) and pulled breakers but failed to read far enough down and only pulled the breakers for the RH pitot static probe. Causing the heat to still be on to the LH probe.We quickly removed heat from probe.Pay more attention to AMM task and I should have double checked the CBs my partner pulled.
Aircraft technicians reported the pitot probe test head melted onto the pitot probe while performing a test of the stall protection computer.