B737-800 captain reported noticing during walk around that the aircraft was very lightly weighted on...

Narrative:

After parking a fully loaded -800; I went to the ramp to do a walk around for our next flight. As I approached the nose wheel well; I immediately noticed that I did not have to bend over to enter the wheel well. The nose scissors and strut were fully extended. I have never seen that on a 737 and first thought it was an over serviced strut. I continued my walk around while thinking over the nose issue. As I returned to the nose I saw the strut actually compress to a normal position. At this point the operations lead came running down the stairs after he immediately stopped passengers from deplaning. He then told me the ramp around [the gate] has a sloping grade rearward. He also said that because of that slope; another carrier actually had a -800 that had [the nose wheel] come off the ground the week before. I found this valuable safety information.

Original NASA ASRS Text

Title: B737-800 Captain reported noticing during walk around that the aircraft was very lightly weighted on the nose wheel when parked at a gate that had a rearward slope.

Narrative: After parking a fully loaded -800; I went to the ramp to do a walk around for our next flight. As I approached the nose wheel well; I immediately noticed that I did not have to bend over to enter the wheel well. The nose scissors and strut were fully extended. I have never seen that on a 737 and first thought it was an over serviced strut. I continued my walk around while thinking over the nose issue. As I returned to the nose I saw the strut actually compress to a normal position. At this point the Operations Lead came running down the stairs after he immediately stopped passengers from deplaning. He then told me the ramp around [the gate] has a sloping grade rearward. He also said that because of that slope; another carrier actually had a -800 that had [the nose wheel] come off the ground the week before. I found this valuable safety information.

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	1317249
Time
Date	201512
Local Time Of Day	1201-1800
Place
Locale Reference	MMUN.Airport
State Reference	FO
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Parked
Flight Plan	IFR
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 168 Flight Crew Type 25000
Events
Anomaly	Ground Event / Encounter Other / Unknown

B737-800 captain reported noticing during walk around that the aircraft was very lightly weighted on the nose wheel when parked at a gate that had a rearward slope.