First officer reported that they flew the departure via radar vectors to a fix. ATC questioned them ...

Attributes
ACN	1292202
Time
Date	201509
Local Time Of Day	0601-1200
Place
Locale Reference	N90.TRACON
State Reference	NY
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Make Model Name	Citation Excel (C560XL)
Operating Under FAR Part	Part 135
Flight Phase	Initial Climb
Route In Use	SID HPN5
Flight Plan	IFR
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 20 Flight Crew Total 14000 Flight Crew Type 45
Events
Anomaly	Deviation - Procedural Clearance Deviation - Track / Heading All Types

Narrative:

Due to rest requirements; I arrived at the aircraft an hour after the PIC. When I arrived at the aircraft; the PIC had already obtained the clearance and loaded the flight plan into the navigation unit. The PIC briefed that the clearance was 'radar vectors' to gayel flight plan route. I asked if we were cleared via the initial climb portion of the SID. No; radar vectors.shortly after takeoff; checked in with departure control. Then shortly after checking in; departure controller said that it looked like we were not on the SID. The SID called for a turn to 295 at 1;000. I replied that we were on radar vectors. The controller gave us a turn to 285; then a heading to gayle. I believe we should have done the initial climb portion of the SID; then expected radar vectors to gayle; but not hearing the clearance; I took the word of the PIC.

Original NASA ASRS Text

Title: First Officer reported that they flew the departure via radar vectors to a fix. ATC questioned them why they were not flying the SID. Controller then gave them a turn to join the SID. First Officer took the word of the pilot in command.

Narrative: Due to rest requirements; I arrived at the aircraft an hour after the PIC. When I arrived at the aircraft; the PIC had already obtained the clearance and loaded the flight plan into the navigation unit. The PIC briefed that the clearance was 'radar vectors' to GAYEL flight plan route. I asked if we were cleared via the initial climb portion of the SID. No; radar vectors.Shortly after takeoff; checked in with departure control. Then shortly after checking in; departure controller said that it looked like we were not on the SID. The SID called for a turn to 295 at 1;000. I replied that we were on radar vectors. The controller gave us a turn to 285; then a heading to GAYLE. I believe we should have done the initial climb portion of the SID; then expected radar vectors to GAYLE; but not hearing the clearance; I took the word of the PIC.

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.

First officer reported that they flew the departure via radar vectors to a fix. ATC questioned them why they were not flying the SID. Controller then gave them a turn to join the SID. First officer took the word of the pilot in command.