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Instructor pilot of an small aircraft sel commenced takeoff prior to tower actual clearance due to the fact that they were in position and holding while another aircraft was on short final. The tower accepted reporter's action and subsequently gave takeoff clearance.
| Attributes | |
| ACN | 365260 |
| Time | |
| Date | 199704 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : slc |
| State Reference | UT |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : dca |
| Operator | general aviation : instructional |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Flight Phase | climbout : takeoff ground : holding |
| Flight Plan | None |
| Aircraft 2 | |
| Make Model Name | Cessna Single Piston Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Flight Phase | landing other |
| Person 1 | |
| Affiliation | Other |
| Function | instruction : instructor |
| Qualification | pilot : cfi pilot : commercial |
| Experience | flight time last 90 days : 60 flight time total : 350 flight time type : 100 |
| ASRS Report | 365260 |
| Person 2 | |
| Affiliation | Other |
| Function | instruction : trainee |
| Qualification | pilot : student |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Holding short and ready for departure. 2 aircraft on final for same runway (runway 35), single engine cessna and light twin. When the single crossed the numbers, we were instructed by tower to position and hold. While waiting for the single to clear the runway, I became concerned about the spacing between myself and the twin on final. The cessna on the runway was instructed to clear the runway immediately and it appeared that tower was also concerned. In anticipation of the cessna clearing the runway and receiving our departure clearance, I started to bring up the power slightly. The cessna cleared and we waited for our clearance. After a few seconds of radio silence I started to ease off the brakes and inch forward and I radioed tower 'salt lake tower, small aircraft X is on the roll, runway 35.' the immediate response from tower was 'roger small aircraft X, thanks for the call.' at that point I released brakes and brought the power to full and began takeoff roll although we still did not have takeoff clearance. This was not standard procedure, but under the given circumstances it seemed like the most sensible action. Once we were well on the roll, tower cleared us for takeoff. Approximately 5-10 seconds after clearance we rotated and became airborne. The event passed without incident and the rest of the flight proceeded as planned.
Original NASA ASRS Text
Title: INSTRUCTOR PLT OF AN SMA SEL COMMENCED TKOF PRIOR TO TWR ACTUAL CLRNC DUE TO THE FACT THAT THEY WERE IN POS AND HOLDING WHILE ANOTHER ACFT WAS ON SHORT FINAL. THE TWR ACCEPTED RPTR'S ACTION AND SUBSEQUENTLY GAVE TKOF CLRNC.
Narrative: HOLDING SHORT AND READY FOR DEP. 2 ACFT ON FINAL FOR SAME RWY (RWY 35), SINGLE ENG CESSNA AND LIGHT TWIN. WHEN THE SINGLE CROSSED THE NUMBERS, WE WERE INSTRUCTED BY TWR TO POS AND HOLD. WHILE WAITING FOR THE SINGLE TO CLR THE RWY, I BECAME CONCERNED ABOUT THE SPACING BTWN MYSELF AND THE TWIN ON FINAL. THE CESSNA ON THE RWY WAS INSTRUCTED TO CLR THE RWY IMMEDIATELY AND IT APPEARED THAT TWR WAS ALSO CONCERNED. IN ANTICIPATION OF THE CESSNA CLRING THE RWY AND RECEIVING OUR DEP CLRNC, I STARTED TO BRING UP THE PWR SLIGHTLY. THE CESSNA CLRED AND WE WAITED FOR OUR CLRNC. AFTER A FEW SECONDS OF RADIO SILENCE I STARTED TO EASE OFF THE BRAKES AND INCH FORWARD AND I RADIOED TWR 'SALT LAKE TWR, SMA X IS ON THE ROLL, RWY 35.' THE IMMEDIATE RESPONSE FROM TWR WAS 'ROGER SMA X, THANKS FOR THE CALL.' AT THAT POINT I RELEASED BRAKES AND BROUGHT THE PWR TO FULL AND BEGAN TKOF ROLL ALTHOUGH WE STILL DID NOT HAVE TKOF CLRNC. THIS WAS NOT STANDARD PROC, BUT UNDER THE GIVEN CIRCUMSTANCES IT SEEMED LIKE THE MOST SENSIBLE ACTION. ONCE WE WERE WELL ON THE ROLL, TWR CLRED US FOR TKOF. APPROX 5-10 SECONDS AFTER CLRNC WE ROTATED AND BECAME AIRBORNE. THE EVENT PASSED WITHOUT INCIDENT AND THE REST OF THE FLT PROCEEDED AS PLANNED.
Data retrieved from NASA's ASRS site as of July 2007 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.