B757 flight crew reported low altitude alert by ATC when aircraft descended due to incorrect automat...

Attributes
ACN	1678987
Time
Date	201908
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	STAR KRATR2
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Commercial
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types Inflight Event / Encounter CFTT / CFIT

Narrative:

Flying from ZZZ I had programmed the FMC to be on the zzzzz arrival landing to the west. Winds in paperwork showed all winds out of west. After takeoff; we were cleared direct to ZZZZZ1 intersection. Enroute to ZZZZZ1 we got the ATIS; landing east. As I changed the runway in the FMC to 10; the controller instructed us to decent via the zzzzz landing east. I selected 5;000 in MCP and noticed that the entire arrival had dropped out of the box. We alerted ATC that the arrival was dumped and he assigned 12;000 feet and present heading. When we finally got [to] zzzzz 10 selected in the box we let ATC know and he said to continue direct ZZZZZ2 and decent via the zzzzz. I selected 5;000 [feet] in altitude selector and started down. Passing through 8;900 feet; the controller asked us to level at 10;000 [feet] due to terrain. I believe that in the rush of this flight and mix up; I never saw the aircraft go back into VNAV path and most likely stayed in VNAV speed to cross at 5;000 [feet]. We stopped descent and leveled back at 10;000 feet. We were vectored for runway 10L and landed without incident. Factors that contributed to event/concern [were] my own fatigue; time pressures; interruptions/distractions; high workload/task saturation; problems with automation; [and] lack of assertiveness.

Original NASA ASRS Text

Title: B757 flight crew reported low altitude alert by ATC when aircraft descended due to incorrect automation management.

Narrative: Flying from ZZZ I had programmed the FMC to be on the ZZZZZ arrival landing to the west. Winds in paperwork showed all winds out of west. After takeoff; we were cleared direct to ZZZZZ1 intersection. Enroute to ZZZZZ1 we got the ATIS; landing east. As I changed the runway in the FMC to 10; the Controller instructed us to decent via the ZZZZZ landing east. I selected 5;000 in MCP and noticed that the entire arrival had dropped out of the box. We alerted ATC that the arrival was dumped and he assigned 12;000 feet and present heading. When we finally got [to] ZZZZZ 10 selected in the box we let ATC know and he said to continue direct ZZZZZ2 and decent via the ZZZZZ. I selected 5;000 [feet] in altitude selector and started down. Passing through 8;900 feet; the Controller asked us to level at 10;000 [feet] due to terrain. I believe that in the rush of this flight and mix up; I never saw the aircraft go back into VNAV path and most likely stayed in VNAV speed to cross at 5;000 [feet]. We stopped descent and leveled back at 10;000 feet. We were vectored for Runway 10L and landed without incident. Factors that contributed to event/concern [were] my own fatigue; time pressures; interruptions/distractions; high workload/task saturation; problems with automation; [and] lack of assertiveness.

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.