DA40 pilot reported that confusing instructions from ground control resulted in a runway incursion.

Narrative:

I called ground control from my parking spot to request a taxi to runway 25R. Runway 25R is on the north side of the field and it is necessary to cross runway 30 to get to runway 25R. I usually takeoff on runway 25L; but today was 25L [was closed]. I received a taxi clearance to taxi via bravo to kilo; hold short of runway 30. As I was taxiing down bravo; I was instructed to hold short of delta. After holding short of delta for approximately two minutes; I was told to continue taxi via kilo; cross 30; and I was instructed to expedite. After reading back the instruction; I added power to quickly accelerate; and ground control issued an instruction to hold short of 30. Then; I thought I heard 'cancel hold short'; which I believe I read back. I; therefore; proceeded to enter runway 30 to continue taxi via kilo. Quickly; I heard 'stop. Stop. Stop.' I then stopped; but had crossed the runway hold markings. Ground control instructed me to turn around and exit the runway; which I did. After receiving instruction to cross runway 30 and taxi via kilo; I continued taxiing. Once in the run-up area; I decided to cancel my flight and received clearance to taxi back to parking. Although I was focused on the taxi operation and was not distracted; in hindsight; I was confused about the multiple instructions regarding crossing runway 30. The lesson I have learned is that I need to be certain of taxi instructions or stop and ask for clarification.

Original NASA ASRS Text

Title: DA40 pilot reported that confusing instructions from Ground Control resulted in a runway incursion.

Narrative: I called Ground Control from my parking spot to request a taxi to runway 25R. Runway 25R is on the north side of the field and it is necessary to cross Runway 30 to get to Runway 25R. I usually takeoff on Runway 25L; but today was 25L [was closed]. I received a taxi clearance to taxi via Bravo to Kilo; hold short of Runway 30. As I was taxiing down Bravo; I was instructed to hold short of Delta. After holding short of Delta for approximately two minutes; I was told to continue taxi via Kilo; cross 30; and I was instructed to expedite. After reading back the instruction; I added power to quickly accelerate; and Ground Control issued an instruction to hold short of 30. Then; I thought I heard 'cancel hold short'; which I believe I read back. I; therefore; proceeded to enter Runway 30 to continue taxi via Kilo. Quickly; I heard 'STOP. STOP. STOP.' I then stopped; but had crossed the runway hold markings. Ground Control instructed me to turn around and exit the runway; which I did. After receiving instruction to cross Runway 30 and taxi via Kilo; I continued taxiing. Once in the run-up area; I decided to cancel my flight and received clearance to taxi back to parking. Although I was focused on the taxi operation and was not distracted; in hindsight; I was confused about the multiple instructions regarding crossing Runway 30. The lesson I have learned is that I need to be certain of taxi instructions or stop and ask for clarification.

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	1510762
Time
Date	201801
Local Time Of Day	1201-1800
Place
Locale Reference	LGB.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	DA40 Diamond Star
Operating Under FAR Part	Part 91
Flight Phase	Taxi
Flight Plan	None
Person 1
Function	Single Pilot Pilot Flying
Qualification	Flight Crew Multiengine Flight Crew Commercial Flight Crew Flight Instructor Flight Crew Instrument
Experience	Flight Crew Last 90 Days 44 Flight Crew Total 592 Flight Crew Type 381
Events
Anomaly	Deviation - Procedural Clearance Ground Incursion Runway