B737-800
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 418; Flight Crew Type 11000
Situational Awareness
Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter CFTT / CFIT
Flight Crew Became Reoriented
Aircraft; Human Factors; Weather; Procedure
This was a flaps 25 departure in a B737-800. [We] entered IMC at 600 FT AGL. On departure; the crew was given an initial turn to 140. At approximately 700 FT AGL; Pilot Flying (PF) called for Heading Select and started the turn. At 1;000 FT AGL PF called for clean up on schedule (set speed; flaps 15; 5; 1 and up). Shortly after clean up; PF received a Bank Angle Alert. PF reduced bank angle but also reduced the pitch without realizing it. Pilot Monitoring (PM) called out the sink. PF was a little disoriented from entering the weather and getting the Bank Angle Alert and did not immediately correct the sink. Crew then received a 'Don't Sink' at 1000 FT AGL. PF then made a flight path correction and continued the climb uneventfully to 3;000 FT MSL. Bank Angle Alert is not that uncommon; but in IMC; excessive bank led to some disorientation. Expectation bias by PF when rolling out of bank 'assumed' everything else was ok; but crosscheck slowed and didn't catch the VVI as descending. PM was busy talking with ATC and then did catch the sink rate. PM did a good job realizing PF went into red during the sink and got 'directive' with PF. We discussed what happened as a crew when we reached cruise and looked at the airport pages. We noticed a couple other Flaps 25 departures with Bank Angle followed by Sink Rate [warnings].
We started a left hand turn and received a Bank Angle Warning; lessened the bank angle; and the aircraft started to lose altitude.
B737-800 Flight Crew reported receiving a BANK ANGLE followed by a DON'T SINK warning at 1;000 feet on climbout.