Date: 201606
Local time of day: 1201-1800
Location: TPA.Airport, FL
Flight conditions: VMC
Weather elements / visibility: Rain
Light: Daylight
Aircraft: Large Transport; Low Wing; 2 Turbojet Eng
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Taxi
ATC / advisory: Ground TPA
Reporter organization: Air Carrier
Reporter function: Captain; Pilot Flying
Reporter qualification: Flight Crew Air Transport Pilot (ATP)
Human factors: Situational Awareness; Distraction
Second reporter function: Pilot Not Flying; First Officer
Anomaly: Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Other / Unknown; Ground Event / Encounter Other / Unknown
Detector: Person Flight Crew
When detected: Taxi
Result: Flight Crew Became Reoriented; Flight Crew Regained Aircraft Control; Flight Crew Took Evasive Action
Contributing factors: Environment - Non Weather Related; Weather; Airport
Primary problem: Weather

Narrative: Received amended clearance during taxi. ATC advised us to stop on Taxiway B so both pilots could copy revised clearance. We were taxiing on one engine (left). Pavement was wet and not grooved. Stopped on B on the east side of the upgrade of the taxiway. Set parking brake and copied clearance. When ready to resume taxi; released parking brake; powered up number 1 engine sufficient for movement. Plane's nose started to drift right. I used tiller to turn back left. Nose skidded further right. Throttle brought to idle. Plane drifted backwards for maybe a linear foot. Brakes were applied. Plane was stopped. Nose wheel was brought to a straight ahead position. Power was added just enough to compensate for the backward pull of gravity; then a slight bit more added to very slowly to move the plane forward. Taxi resumed without incident.


Second narrative: During the taxi out of TPA we were told to contact clearance for a reroute. We were taxiing out single engine not knowing how long our taxi was going to be with the current weather conditions at the airport as well as enroute. The Captain and I decided to taxi to a place where we could set the parking brake and both be heads down to copy the reroute about to be given. We taxied to the Bravo Taxiway and asked ground if this was an acceptable place to stop; they said that it was and let him know when ready to continue. After the reroute was accepted by us we continued our taxi up the Bravo taxiway. The ground was wet and we were single engine as well facing an uphill taxiway. The captain applied thrust to the operating engine and we began to move although the nose wheel started to slide towards then non-operating engine. The captain then began the use of opposite tiller application which then the nose wheel began to slide further away from centerline. At that time the captain applied the brakes and stopped the aircraft before further sliding occurred. The Captain then restarted the taxi with a little more caution and we continued to the runway without any other issues.


Synopsis: Flight crew reported that during single engine taxiing uphill in wet conditions on TPA Taxiway B; the aircraft nose wheel slid as thrust was increased to maintain speed. The Captain stopped; realigned the aircraft; and continued taxiing slowly.