<< >> NASA ASRS Report 1511645, December 2017

Boeing 737-800 captain reported executing a rejected takeoff due to a low pressure and feel differential lights becoming illuminated.

Attributes
ACN	1511645
Time
Date	201712
Local Time Of Day	0001-0600
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
Flight Plan	IFR
Component
Aircraft Component	Hydraulic Syst Pressure/Temp Indication
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy

Narrative:

During the takeoff roll at about 70 knots; the left flight control low pressure and feel differential lights illuminated. I elected to reject the takeoff. We cleared the runway and ran the QRH for the lights. I discovered that the left flight control guard switch was not fully down. I closed the guard; and system reset. We evaluated the brake cooling. No wait time required. We were still above the minimum takeoff fuel; and taxied back for takeoff. I did advise the passengers for the reason for the reject and also advised that the problem was fixed. The threat is that a guard switch; that might look fully down; could in fact jar loose on the takeoff roll.

Related reports:

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Original NASA ASRS Text

Title: Boeing 737-800 Captain reported executing a rejected takeoff due to a Low Pressure and Feel Differential lights becoming illuminated.

Narrative: During the takeoff roll at about 70 knots; the left Flight Control Low Pressure and Feel Differential lights illuminated. I elected to reject the takeoff. We cleared the runway and ran the QRH for the lights. I discovered that the Left Flight Control Guard switch was not fully down. I closed the guard; and system reset. We evaluated the brake cooling. No wait time required. We were still above the minimum takeoff fuel; and taxied back for takeoff. I did advise the passengers for the reason for the reject and also advised that the problem was fixed. The threat is that a guard switch; that might look fully down; could in fact jar loose on the takeoff roll.

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.