B737 flight crew reported momentary loss of aircraft control during taxi out for takeoff.
Synopsis
B737 flight crew reported momentary loss of aircraft control during taxi out for takeoff.
Narrative
During single engine taxi out of the ramp; we stoped at a spot short of the service road. The spot sits on a relative incline; compared to the ramp. We received our taxi clearance of Taxiway 1-Taxiway 2-XXR. The trainee used the control column toggle down transmit to read back the clearance. This error was recognized and read back on the correct transmitter. When I released the parking brake to taxi; I initially pushed up the number 1 thrust lever by accident. Because of the incline; we began to slowly roll backwards. I immediately pushed up the number 2 thrust lever to about 60%. I lightly touched the brakes; but did not want to induce a tail tip. We had to wait for engine 2 to spool up and provide enough thrust to stop our roll and create forward movement. We probably rolled backwards for 5-10 feet. Fortunately; there was no traffic behind us. I am very familiar with ZZZ and all of its taxiways. It was a mistake that happened at one of the worst places on the airport it could have happened at.
Second reporter narrative
Conducting OE (Operating Experience) training on our ZZZ-ZZZ1 flight. Flaps 5 max power NADP (Noise Abatement Departure Procedure) departure off of XXR; for training. Clearance was climb via the ZZZZZ2 RNAV. At 6300 feet indicated; ATC instructed us to level off at 7000 feet. We were climbing at 2000+ feet per minute; with the expectation of cleaning up at 3000 feet AGL. We were able to level off just fine; however; it really was an unexpected clearance. Our VNAV disconnected with 180 kts in the window; we still had flaps 5 out...it was a strain on our situational awareness to correct the MCP (Mode Control Panel) and comply. We ended up abandoning our NADP plan and cleaned up level at 7; after bugging the clean maneuver speed. We continued at 7000 feet for a couple minutes and were then cleared up to 8;000 feet. ATC told us the level off was because of traffic off of 8 in the west. I don't know what that means. It just happened really fast and caught us by surprise...off all the times to be doing an NADP.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.