B737 Undifferentiated or Other Model
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Flight Crew Last 90 Days 180
Confusion; Troubleshooting
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Other / Unknown
Flight Crew FLC complied w / Automation / Advisory
Aircraft; Human Factors
Completed brief with ground crew for coordination; checked hand microphone Captain side during preflight with ground crew; due to INOP APU and push to talk switch on Captain yoke. Completed all checklist; cleared to start number 1; FO (First Officer) began to start number 2 in error; ground crew and myself recognized error and immediately aborted start of number 2. Completed checklist again and correctly started number 1. Generator on number 1 was unable to carry electric load for required configuration and would be unsafe to power up engine at gate; so start was aborted and ground; operations; and maintenance were advised. Parking checklist completed aircraft grounded by maintenance with write-up of number one generator and passengers were deplaned and put on another aircraft along with crew.
B737 Captain reported the generator was unable to carry aircraft electrical load.