B737 Undifferentiated or Other Model
Flight Crew Last 90 Days 123
Training / Qualification; Confusion
Deviation - Altitude Excursion From Assigned Altitude; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Became Reoriented
Human Factors; Procedure
On the arrival we descended via to 7000 feet; as per the chart the last fix altitude was 4000 feet; not sure if we should continue to 4000 feet we continued descending past 7000 feet.   When we asked Approach they cleared us to 4000 feet.  Momentary confusion on descending to 4000 feet.
We were on the EAGUL 5 RNAV Arrival RWY 8 transition to PHX. The FO was the pilot flying and I was the pilot not flying. The FO went over the arrival briefing and we settled on 7000 feet as the proper altitude limit for descending via the EAGUL 5; once PHX Approach cleared us to descend via the EAGUL 5. Approach gave us an early reduction to 210 knots; but we continued to descend via. Once we passed HINEY; I got it in my mind that we should actually be descending to 4000 feet. I was improperly looking at the Runway 25 transitions. I mentioned this to the FO who had noticed the 4000' altitude in small print after HINEY and began a descent. About the time we reached 6000 feet; I caught the error and told the FO to level off. I asked Approach what altitude he wanted us to be at and he told us to descend to 4000 feet. The flight was uneventful from there. It didn't appear that ATC was aware of our error.
B737 flight crew reported becoming confused as to the lowest altitude to maintain during the EAGUL 5 arrival to PHX landing east. The crew descended below 7;000 feet after HINEY before asking ATC for guidance.