Large Transport
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 148
Situational Awareness; Human-Machine Interface; Fatigue
Deviation - Altitude Crossing Restriction Not Met; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Provided Assistance; Flight Crew Returned To Clearance
Human Factors; Procedure
This occurred on the second day of a three-day am trip. Both of the two mornings were about (time removed) reports and I hadn't slept a full night before either day. I recall that both the First Officer and I were fighting to keep alert on this leg as we began the arrival. The FRNCH3 Arrival was briefed as normal; but not very far into the arrival; we were vectored off and given multiple vectors and descents which I complied with using Heading Select and Level Change. Finally; we were cleared direct to BABAA intersection to rejoin the arrival and to descend via the remainder of the FRNCH3. LNAV was engaged direct to BABAA and we set 11;000 feet in the MCP altitude window; as this was the lowest altitude on arrival. However; I failed to reselect VNAV mode; and with the aircraft still in Level Change; we descended through the BABAA restriction of 13;000 feet prior to BABAA. At about 12;500 feet and nearly to BABAA; Approach queried us by asking if we were going to cross BABAA at 13;000 feet. I quickly climbed back to up to 13;000 feet but crossed BABAA at 12;500 feet; and promptly got the aircraft back into VNAV for the rest of the uneventful arrival and flight.
[Report narrative contained no additional information.]
Air carrier flight crew reported not making a crossing restriction on the FRNCH3 STAR to DEN.