Narrative:

It was my second day back to work after being off from work for medical reasons for 3 weeks. The facility was short staffed due to one person calling out sick for the evening. Hold over time was issued; but the person on overtime was not cpc (certified professional controller); only ground certified. The atm (air traffic manager); who is still certified in the tower; was to provide a break for me. Shortly before the incident; I gave the ground controller a break. The atm then came up to the tower to look over a power outage issue in the cab. During this time the following events transpired. I had all positions combined; local; ground; flight data and controller in charge. I had 3 aircraft in the pattern doing touch and go's; 7 aircraft taxiing to the active runway for departure with two being IFR and 1 aircraft inbound that was IFR. (The IFR clearance for aircraft X had been issued by the ground controller that was on a break). The atm noticed that there was starting to be a buildup of traffic and called the ground controller off from break. The atm also noticed that an ATIS was needed and so made the recording for me since I was unable to at the time due to workload. Aircraft X called ready for departure from taxiway A2. I instructed aircraft X to hold short of runway 28 at A2 for landing traffic; plus there was an aircraft in front of aircraft X. He read back 'holding short A2'; but not the runway 28. Then aircraft Y called ready for departure also from taxiway A2. I instructed aircraft Y to hold short of runway 28 at A2 for landing traffic; aircraft Y was number one in sequence. He also read back 'holding short at A2'; but not the runway 28. Once the landing aircraft was no longer a factor I cleared aircraft Y for takeoff with a north departure. I then asked aircraft X their direction of flight; to which the reply was 'north'. Once aircraft Y turned on course I cleared aircraft X for takeoff with a north departure approved; assuming the aircraft was VFR. At some point the ground controller had returned to the tower; but we were unable to do a position briefing due to workload. During the takeoff roll for aircraft X; a position briefing was finally accomplished. Aircraft X then requested headings. Upon hearing the request I realized the aircraft was an IFR departure and contacted the approach facility to advise them of the deviation from procedure. I believe that being off from work for 3 weeks then being made to work all positions combined while staffing is available is bad practice. As noted above the atm was facility rated. The atm noticed that there was a buildup of traffic; but instead of assuming the ground position when there was a possibility; another controller was called that was unable to help prior to the incident. After the incident and after the ground controller assumed the position; I requested the atm take the controller in charge position to further de-combine during a busy time. The atm declined; yet remained in the tower for approximately 15 minutes. I was eventually relieved from local position by the atm after being on for over 2 hours 40 minutes. The atm; knowing the lack of staffing; was supposed to assist with coverage but did not adequately.

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Original NASA ASRS Text

Title: LAF Controller describes a situation where the facility is short staffed and the Controller departs two aircraft in sequence; thinking the second is VFR. The second aircraft is IFR and the Controller has a loss of separation.

Narrative: It was my second day back to work after being off from work for medical reasons for 3 weeks. The facility was short staffed due to one person calling out sick for the evening. Hold over time was issued; but the person on overtime was not CPC (Certified Professional Controller); only ground certified. The ATM (Air Traffic Manager); who is still certified in the tower; was to provide a break for me. Shortly before the incident; I gave the ground controller a break. The ATM then came up to the tower to look over a power outage issue in the cab. During this time the following events transpired. I had all positions combined; Local; Ground; Flight data and CIC. I had 3 aircraft in the pattern doing touch and go's; 7 aircraft taxiing to the active runway for departure with two being IFR and 1 aircraft inbound that was IFR. (The IFR clearance for Aircraft X had been issued by the ground controller that was on a break). The ATM noticed that there was starting to be a buildup of traffic and called the ground controller off from break. The ATM also noticed that an ATIS was needed and so made the recording for me since I was unable to at the time due to workload. Aircraft X called ready for departure from taxiway A2. I instructed Aircraft X to hold short of RWY 28 at A2 for landing traffic; plus there was an aircraft in front of Aircraft X. He read back 'Holding short A2'; but not the runway 28. Then Aircraft Y called ready for departure also from taxiway A2. I instructed Aircraft Y to hold short of runway 28 at A2 for landing traffic; Aircraft Y was number one in sequence. He also read back 'Holding short at A2'; but not the runway 28. Once the landing aircraft was no longer a factor I cleared Aircraft Y for takeoff with a north departure. I then asked Aircraft X their direction of flight; to which the reply was 'North'. Once Aircraft Y turned on course I cleared Aircraft X for takeoff with a north departure approved; assuming the aircraft was VFR. At some point the ground controller had returned to the tower; but we were unable to do a position briefing due to workload. During the takeoff roll for Aircraft X; a position briefing was finally accomplished. Aircraft X then requested headings. Upon hearing the request I realized the aircraft was an IFR departure and contacted the approach facility to advise them of the deviation from procedure. I believe that being off from work for 3 weeks then being made to work all positions combined while staffing is available is bad practice. As noted above the ATM was facility rated. The ATM noticed that there was a buildup of traffic; but instead of assuming the ground position when there was a possibility; another controller was called that was unable to help prior to the incident. After the incident and after the ground controller assumed the position; I requested the ATM take the CIC position to further de-combine during a busy time. The ATM declined; yet remained in the tower for approximately 15 minutes. I was eventually relieved from local position by the ATM after being on for over 2 hours 40 minutes. The ATM; knowing the lack of staffing; was supposed to assist with coverage but did not adequately.

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.