Narrative:

It was first officer's (first officer) leg departing from runway 28 maf. Weather was VFR with gusty winds out of the west. We departed from 28; and at 500 ft. AGL we received the 'terrain; terrain; pull up.' we executed the terrain avoidance maneuver until it ceased; which was at 4600 ft. MSL. First officer pitched the nose over to start cleaning up the aircraft and the 'terrain; terrain; pull up' went off again. First officer executed the terrain avoidance maneuver until about 5600 ft. MSL. First officer leveled off yet again; cleaned up the aircraft; and then flew to our destination with no further problems.trying to make sense of the situation; at cruise altitude; we reviewed what had happened. We took a closer look at the takeoff data and realized we misinterpreted the station information page noting the code needed for a 28 departure. We interpreted C/28 as being the full length when it needed to be the total distance. In the future the crew will be more diligent as to making sure takeoff data is clear. Also making sure a takeoff/landing report is provided by operations could also have helped this situation. We should have made sure to have a takeoff/landing report present and reviewed it prior to departure. It seems like these are optional paperwork items but are important. Despite having recently gone through maf; it is a good idea to review the station notes every departure and arrival. Additive conditions can change so as to have different parts of a station information page become or don't become relevant.

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Original NASA ASRS Text

Title: Air carrier flight crew reported experiencing a terrain warning on initial climb due to a malfunctioning GPWS.

Narrative: It was FO's (First Officer) leg departing from Runway 28 MAF. Weather was VFR with gusty winds out of the west. We departed from 28; and at 500 ft. AGL we received the 'Terrain; Terrain; PULL UP.' We executed the terrain avoidance maneuver until it ceased; which was at 4600 ft. MSL. FO pitched the nose over to start cleaning up the aircraft and the 'Terrain; Terrain; PULL UP' went off again. FO executed the terrain avoidance maneuver until about 5600 ft. MSL. FO leveled off yet again; cleaned up the aircraft; and then flew to our destination with no further problems.Trying to make sense of the situation; at cruise altitude; we reviewed what had happened. We took a closer look at the takeoff data and realized we misinterpreted the station information page noting the code needed for a 28 departure. We interpreted C/28 as being the full length when it needed to be the total distance. In the future the crew will be more diligent as to making sure takeoff data is clear. Also making sure a takeoff/landing report is provided by Operations could also have helped this situation. We should have made sure to have a takeoff/landing report present and reviewed it prior to departure. It seems like these are optional paperwork items but are important. Despite having recently gone through MAF; it is a good idea to review the station notes every departure and arrival. Additive conditions can change so as to have different parts of a station information page become or don't become relevant.

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.