A B757-200 flight crew overshot a hard altitude at PAYSO on the EAGUL 3 RNAV STAR to PHX.
Synopsis
A B757-200 flight crew overshot a hard altitude at PAYSO on the EAGUL 3 RNAV STAR to PHX.
Narrative
While descending via the EAGUL3 RNAV into PHX; 12000 was set in the MCP altitude window and VNAV was initially selected. During descent the First Officer opened the speed brakes and selected speed intervene to get the green arc on PAYSO. This was his first trip after IOE so I explained with 12000 in the MCP and 240 programmed for PAYSO the green arc would not be on PAYSO. The First Officer then closed the speed brakes and I thought closed the speed intervene - in fact he selected FLCH (flight level change). Descent continued and shortly thereafter I expected the aircraft to level at 240 for PAYSO but about 3 miles prior it continued descent through 240 [a required crossing flight level]. I then saw FLCH and said we needed to level at 240. The aircraft dipped to FL23.6 and was returned to 240. The rest of the descent continued normally. My not noticing the selection of FLCH; radio calls; new MCP SOP; being somewhat tired and First Officer 'newness' with Boeing were all contributing factors.
Second reporter narrative
Cleared to descend via EAGUL arrival with no speed restrictions; cross HOMRR at 250/12;000. Descended below 240 about 2 miles prior to PAYSO. Recognized late that we were going below 240 prior to crossing restriction point. Went as low as 23650 or so and corrected back. Human factors were fatigue and lack of recent experience on the 757.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.