B737 MAX flight crew reported an unstabilized approach and associated GPWS warning due to flap misconfiguration. The flight crew set flaps correctly and continued to landing.
Synopsis
B737 MAX flight crew reported an unstabilized approach and associated GPWS warning due to flap misconfiguration. The flight crew set flaps correctly and continued to landing.
Narrative
On short final during a visual approach to Runway XXL at ZZZ we were alerted by a GPWS audible annunciation of 'Too Low; Flaps' at approximately 200 ft. AGL. I was hand flying the aircraft at the time and stated to the First Officer; 'We are at flaps 30; right? He took a look and said no; we're at 25; and simultaneously moved the flap lever to the 30 degree position. We proceeded to complete the approach and landing uneventfully.We were flying a 737 MAX; which is rare for me; and I initially wasn't sure if I wanted to set up the flight instrument displays so that the engine instruments and flaps display were on my Multi-function Flight Display or the First Officer's. I opted to have them on the First Officer's side and have a larger map display on my side. This put the flap display further from my view. We had completed the before landing checklist at approximately 2;000 ft. AGL; and both of us thought we had verified flaps at 30 degrees; but apparently we were still at 25. The First Officer mentioned he might have gone to flaps 10 when I called for 15; and then was behind by one notch for each subsequent call. I believe when I called for flaps 30; the lever was moved from 15 to 25; and regrettably; neither of us caught the discrepancy. The approach remained stable throughout the incident. In retrospect; upon receiving the alert; we should have executed a go-around. This would have prevented us from making a configuration change below the standard 1;000 approach criteria. In the future; I'll also be more careful to take a close look at the flap indication for each setting; and set up the Multi-function Flight Display so that when I'm the flying pilot on the MAX; I'll keep the gauges displayed closer to me to facilitate an accurate reading.
Second reporter narrative
On short final to Runway XXL visual approach to ZZZ we were alerted by the GPWS warning flaps too low at approximately 200 ft. AGL. I was non flying pilot. Captain asked if we were flaps 30 and I stated no and put the flaps to 30 degrees. We continued and landed uneventfully. I had an early commute coupled by a delay making a long day longer and flying a 737 MAX; which I see once in a while. Upon configuration when the pilot called for flaps 15 I believe I selected flaps 10 thus when flaps 30 was called I selected flaps 2. Being very tired I didn't catch this and even on the check list neither of us caught the flaps not being at 30. Leaving I felt fine but a half hour before landing became tired. Should have emphasized that to the Captain on the brief that I am tired and back me up. When tired double check checklist items.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.