Narrative:

Inbound aircraft had various write-ups that maintenance cleared. Those included an ACARS reporting issue; lavs overflowing; and autobrakes failing to arm. One write-up that wasn't cleared was the landing gear lever lock solenoid was not working properly thus crew has to use the override procedures. It was deferred [a few days prior]. Aircraft was dispatched and departed. Shortly after reaching cruise altitude we passed a waypoint but the howgozit did not update with actual fuel and time. Dispatch then sent a message asking about our delayed takeoff. I then pulled up ACARS prog identification/sensor page which displayed air/ground in ground. Flight manual procedures and systems involved were nonexistent. Very disappointing. Crew felt a normal landing could be made at destination. Several hours later; near coast in; flight attendant notified flight deck that the mid lavs were overflowing. Did not know at the time that the drain mast heaters still were in ground mode which is inadequate at altitude. Normal landing at ZZZ. ZZZ maintenance was shown a printed page of the ACARS sensor page showing air/ground in ground. Outbound crew was briefed on aircraft issues. Hindsight says air/ground switch should have been tested [at other airports]. As important; the flight manual needs to have systems that are related to this switch.

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Original NASA ASRS Text

Title: The flight crew of a B767 reported that various systems were inoperative due to a defective air/ground sensor.

Narrative: Inbound aircraft had various write-ups that maintenance cleared. Those included an ACARS reporting issue; lavs overflowing; and autobrakes failing to arm. One write-up that wasn't cleared was the landing gear lever lock solenoid was not working properly thus crew has to use the override procedures. It was deferred [a few days prior]. Aircraft was dispatched and departed. Shortly after reaching cruise altitude we passed a waypoint but the HOWGOZIT did not update with actual fuel and time. Dispatch then sent a message asking about our delayed takeoff. I then pulled up ACARS Prog ID/Sensor page which displayed AIR/GND in GND. Flight Manual procedures and systems involved were nonexistent. Very disappointing. Crew felt a normal landing could be made at destination. Several hours later; near coast in; Flight Attendant notified flight deck that the Mid Lavs were overflowing. Did not know at the time that the drain mast heaters still were in ground mode which is inadequate at altitude. Normal landing at ZZZ. ZZZ maintenance was shown a printed page of the ACARS sensor page showing AIR/GND in GND. Outbound crew was briefed on aircraft issues. Hindsight says AIR/GND switch should have been tested [at other airports]. As important; the Flight Manual needs to have systems that are related to this switch.

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.