CE750 pilot reported receiving GPWS terrain alarm along with ATC alert while on departure from vny.

Attributes
ACN	1548864
Time
Date	201806
Local Time Of Day	0001-0600
Place
Locale Reference	VNY.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Citation X (C750)
Flight Phase	Climb
Route In Use	SID WLKKR3
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types Inflight Event / Encounter CFTT / CFIT

Narrative:

We took off from vny on the WLKKR3 departure; I was the pilot monitoring. We were cleared to take off via the SID; complying with the departure we crossed 1.7 DME from vny at 1;750 feet then initiated our climb to 4;000 feet and a turn to a heading of 210. Then we got the GPWS calling the terrain alarm. We [kept] climbing and no conflict or [deviation] from ATC procedure had to take place. ATC did call the terrain alert simultaneously with the GPWS. We failed to climb in a timely fashion and therefore we got the warning. We did brief the departure several times and mentioned that 1;750 feet will come really fast and briefed the terrain around the airport. I was thinking of two solutions. One; regardless of the crew's [number of days] of flying one should [only] fly tasks one can do. If the captain does not think the other pilot can handle the task he or she should fly it. The second suggestion I had is to brief [the departure] more [than a] couple times and make sure there are no misunderstandings.

Original NASA ASRS Text

Title: CE750 pilot reported receiving GPWS terrain alarm along with ATC alert while on departure from VNY.

Narrative: We took off from VNY on the WLKKR3 departure; I was the pilot monitoring. We were cleared to take off via the SID; Complying with the departure we crossed 1.7 DME from VNY at 1;750 feet then initiated our climb to 4;000 feet and a turn to a heading of 210. Then we got the GPWS calling the terrain alarm. We [kept] climbing and no conflict or [deviation] from ATC procedure had to take place. ATC did call the terrain alert simultaneously with the GPWS. We failed to climb in a timely fashion and therefore we got the warning. We did brief the departure several times and mentioned that 1;750 feet will come really fast and briefed the terrain around the airport. I was thinking of two solutions. One; regardless of the crew's [number of days] of flying one should [only] fly tasks one can do. If the captain does not think the other pilot can handle the task he or she should fly it. The second suggestion I had is to brief [the departure] more [than a] couple times and make sure there are no misunderstandings.

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.