<< >> NASA ASRS Report 1480347, September 2017

BE40 flight crew reported a failure to begin a descent when cleared for a crossing restriction on the route of flight.

Attributes
ACN	1480347
Time
Date	201709
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	Beechjet 400
Operating Under FAR Part	Part 135
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	FMS/FMC
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Deviation - Altitude Undershoot Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Clearance Flight Deck / Cabin / Aircraft Event Other / Unknown

Narrative:

We were assigned a crossing restriction to cross ZZZ VOR at FL180. I watched my copilot adjust the altitude selector and program the FMS. I reprogrammed the angle of descent and was certain I selected VNAV myself on the mode select panel. We were the only aircraft in the sky last night so everything was silent. We were just cruising along when I started wondering about our next ATC handoff. That's when I noticed we were crossing ZZZ VOR still at FL310. VNAV had apparently not been selected. I immediately initiated a descent and as soon as the descent was establish the controller; sounding a little confused; gave us that frequency change I had been waiting for.

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Original NASA ASRS Text

Title: BE40 flight crew reported a failure to begin a descent when cleared for a crossing restriction on the route of flight.

Narrative: We were assigned a crossing restriction to cross ZZZ VOR at FL180. I watched my copilot adjust the altitude selector and program the FMS. I reprogrammed the angle of descent and was certain I selected VNAV myself on the mode select panel. We were the only aircraft in the sky last night so everything was silent. We were just cruising along when I started wondering about our next ATC handoff. That's when I noticed we were crossing ZZZ VOR still at FL310. VNAV had apparently not been selected. I immediately initiated a descent and as soon as the descent was establish the controller; sounding a little confused; gave us that frequency change I had been waiting for.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.