B737 captain reported a ramp employee gave the stop signal while taxiing into the gate using the acc...

Narrative:

We were pulling into gate xx at ZZZ. Had engines at idle the entire time. The accu-park system was on and giving us proper guidance. With about 40 feet remaining on the sign; I noticed out of the corner of my eye a marshaller standing off to the left giving me the stop sign. We stopped with about 35 feet showing left on the parking system. We were getting conflicting information from the marshaller and the parking system. The marshaller was giving us the shutdown engine sign; which we did while querying ramp/ops if they had any information. After the marshaller plugged in; he said we would have hit a catering truck which was off to the right. The safety zone was clear when we were making the turn in and the first officer (first officer) said we were clear as we were nearing the gate. There was an aircraft at [the adjacent gate] with a catering truck at door 2; which could have moved giving the marshaller concern. I have 2 safety concerns about this evolution. One; if there was a truck in the safety zone; the system should have given us a stop signal. The second; I barely noticed the marshaller giving us the stop signal; as he was off to the left and I was concentrating on the parking system. If in fact there was a chance of hitting anything; he should have been much more visible about getting our attention or been able to turn off the parking system. After we towed the rest of the way to the gate; I talked with him on the interphone and stated these concerns. He stated the shutoff for the parking was on the other side of the jetbridge; and he understood my concerns.

Original NASA ASRS Text

Title: B737 Captain reported a ramp employee gave the stop signal while taxiing into the gate using the accu-park because a truck had pulled into the safety zone.

Narrative: We were pulling into gate XX at ZZZ. Had engines at idle the entire time. The accu-park system was on and giving us proper guidance. With about 40 feet remaining on the sign; I noticed out of the corner of my eye a marshaller standing off to the left giving me the stop sign. We stopped with about 35 feet showing left on the parking system. We were getting conflicting information from the marshaller and the parking system. The marshaller was giving us the shutdown engine sign; which we did while querying ramp/ops if they had any information. After the marshaller plugged in; he said we would have hit a catering truck which was off to the right. The safety zone was clear when we were making the turn in and the FO (First Officer) said we were clear as we were nearing the gate. There was an aircraft at [the adjacent gate] with a catering truck at door 2; which could have moved giving the marshaller concern. I have 2 safety concerns about this evolution. One; if there was a truck in the safety zone; the system should have given us a STOP signal. The second; I barely noticed the marshaller giving us the stop signal; as he was off to the left and I was concentrating on the parking system. If in fact there was a chance of hitting anything; he should have been much more visible about getting our attention or been able to turn off the parking system. After we towed the rest of the way to the gate; I talked with him on the interphone and stated these concerns. He stated the shutoff for the parking was on the other side of the jetbridge; and he understood my concerns.

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.

Attributes
ACN	1584590
Time
Date	201810
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 150 Flight Crew Type 1524
Events
Anomaly	Conflict Ground Conflict Less Severe Deviation - Procedural Published Material / Policy

B737 captain reported a ramp employee gave the stop signal while taxiing into the gate using the accu-park because a truck had pulled into the safety zone.