B737-800 first officer reports forgetting to turn on the probe heat switches prior to takeoff after ...

Narrative:

We had return to the gate for a mechanical problem which maintenance fixed. We ran the checklist again; started and taxied normally. During the takeoff roll we got a master caution light which I inadvertently and instinctively punched off. The speed was 90 KTS. There were no high speed abort item indications. In flight; we discovered that we left the probe heat switches off; which we then turned on. Also; both engine eec's [engine electronic control] were in alternate mode. We ran the QRH procedure and selected alternate on the eec's switches. We suspected that the probe heat switches off triggered the eec's to automatically switch to alternate. No engine parameters were exceeded and the eec's reset normally at our destination.checklist discipline; review abort parameters and procedures.

Original NASA ASRS Text

Title: B737-800 First Officer reports forgetting to turn on the probe heat switches prior to takeoff after returning to the gate for maintenance. Lack of probe heat apparently caused the EEC's to revert to alternate mode triggered a master caution during takeoff which was investigated airborne.

Narrative: We had return to the gate for a mechanical problem which maintenance fixed. We ran the checklist again; started and taxied normally. During the takeoff roll we got a master caution light which I inadvertently and instinctively punched off. The speed was 90 KTS. There were no high speed abort item indications. In flight; we discovered that we left the probe heat switches off; which we then turned on. Also; both engine EEC's [Engine Electronic Control] were in alternate mode. We ran the QRH procedure and selected alternate on the EEC's switches. We suspected that the probe heat switches off triggered the EEC's to automatically switch to alternate. No engine parameters were exceeded and the EEC's reset normally at our destination.Checklist discipline; review abort parameters and procedures.

Data retrieved from NASA's ASRS site as of April 2012 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	913205
Time
Date	201010
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Dawn
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Component
Aircraft Component	Engine Control
Person 1
Function	Pilot Not Flying First Officer
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy

B737-800 first officer reports forgetting to turn on the probe heat switches prior to takeoff after returning to the gate for maintenance. Lack of probe heat apparently caused the eec's to revert to alternate mode triggered a master caution during takeoff which was investigated airborne.