A departing aircraft was issued a direct routing leaving 3;000 feet. The pilot read back the routing...

Narrative:

I was the on the job training (OJT) instructor. Aircraft X departed IFR climbing out of 700 feet. We identified aircraft X and instructed them 'reaching 3;000 feet; turn right direct airport ZZZ'. The pilot read back 'roger coming right direct ZZZ'; and we didn't catch the incorrect read back. Aircraft X data block never acquired; and I observed the primary target west of the departure corridor by about 1.5 miles; climbing out of 1;700 feet and realized what had happened. The trainee asked 'aircraft X verify heading 200' and aircraft X responded 'negative; we are heading 297; direct ZZZ'. I took over and asked if aircraft X could maintain his own terrain and obstruction clearance; because he was now in a 3;700 foot minimum vectoring altitude; the pilot responded 'yes'; I instructed the trainee to issue the clearance and after aircraft X passed 3;700 feet he was cleared as filed.expectation bias was a large factor in this; more attentive listening on our part would have prevented this from occurring.

Original NASA ASRS Text

Title: A departing aircraft was issued a direct routing leaving 3;000 feet. The pilot read back the routing; but not the altitude instruction. The readback was not noticed by the controllers and the aircraft proceeded on course below the Minimum Vectoring Altitude.

Narrative: I was the On the Job Training (OJT) Instructor. Aircraft X departed IFR climbing out of 700 feet. We identified Aircraft X and instructed them 'reaching 3;000 feet; turn right direct Airport ZZZ'. The pilot read back 'roger coming right direct ZZZ'; and we didn't catch the incorrect read back. Aircraft X data block never acquired; and I observed the primary target west of the departure corridor by about 1.5 miles; climbing out of 1;700 feet and realized what had happened. The Trainee asked 'Aircraft X verify heading 200' and Aircraft X responded 'negative; we are heading 297; direct ZZZ'. I took over and asked if Aircraft X could maintain his own terrain and obstruction clearance; because he was now in a 3;700 foot minimum vectoring altitude; the pilot responded 'yes'; I instructed the trainee to issue the clearance and after Aircraft X passed 3;700 feet he was cleared as filed.Expectation bias was a large factor in this; more attentive listening on our part would have prevented this from occurring.

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	1324512
Time
Date	201601
Local Time Of Day	1801-2400
Place
Locale Reference	FAI.TRACON
State Reference	AK
Aircraft 1
Make Model Name	Small Aircraft
Operating Under FAR Part	Part 91
Flight Phase	Initial Climb
Route In Use	Vectors
Flight Plan	IFR
Person 1
Function	Departure Instructor
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 9
Events
Anomaly	ATC Issue All Types Airspace Violation All Types Conflict Ground Conflict Less Severe Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy

A departing aircraft was issued a direct routing leaving 3;000 feet. The pilot read back the routing; but not the altitude instruction. The readback was not noticed by the controllers and the aircraft proceeded on course below the minimum vectoring altitude.