Small Transport; Low Wing; 2 Turboprop Eng
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 12
Confusion; Training / Qualification
ATC Issue All Types; Airspace Violation All Types; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Issued New Clearance
Human Factors; Procedure
I was training a developmental at the Low East radar position.  Aircraft X departed NGP airport on an IFR flight plan.  My trainee radar identified the aircraft and issued him clearance to 9;000 feet and heading 350; to join VICTOR 13.  The pilot read back the instructions.  After the CRP North Radar controller accepted the handoff; my trainee instructed the pilot to contact Corpus Approach.  Before the pilot had the time to switch frequencies; the trainee thought that the pilot was tracking further west than the 350; heading and made an effort to clarify the heading.  He told the pilot that he appeared to be heading 330; and that he should be heading 350.The pilot then switched frequencies; heading 350.  We believed that he would join VICTOR 13; however; the pilot flew past the airway and continued on the 350 heading; and entered an active MOA without clearance into it.This description is as I recall it; without the benefit of reviewing any tape recording or data.  I believe that when the developmental tried to explain to the pilot that he did not appear to be flying the correct heading; the pilot thought that he was given a new clearance to 'fly heading 350;' effectively canceling the previous instruction to 'join VICTOR 13.'   I failed to realize the possible miscommunication; and the pilot eventually flew into the MOA.I do not recommend any changes to procedures; as this was a simple lack of attentiveness on my part; evidently.  I will endeavor to pay better attention to detail in the future and not allow this; or anything like this; to re-occur.
A CRP Controller; while instructing; has an aircraft that is supposed to fly heading 350 and join V13. The developmental sees the aircraft not tracking correctly and instructs the aircraft to fly heading 350. The aircraft later enters a MOA because it didn't join V13. The Controller didn't realize at the time that the developmental should have reiterated the heading and also to join the airway.