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Departing flight given clearance with acknowledgement by transponder code only. On SID at 4000' MSL departure controller advised flight should have been at 3000'.
| Attributes | |
| ACN | 152420 |
| Time | |
| Date | 199007 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : iah |
| State Reference | TX |
| Altitude | msl bound lower : 3000 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : iah tower : iah |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | departure other departure sid : sid |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : cfi pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 200 flight time total : 14000 flight time type : 2500 |
| ASRS Report | 152420 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 11500 flight time type : 190 |
| ASRS Report | 152421 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
| Situations | |
| ATC Facility | procedure or policy : unspecified |
Narrative:
Clearance was iah 4 departure with an initial level off altitude of 400' MSL. On readback we read only the transponder code which was acknowledged by clearance delivery. After takeoff aircraft was leveled at 4000'. Departure control said we were only cleared to 3000', which we did not hear in the original clearance or any subsequent clearance. ATC requests readback of only transponder code in clearance. Any altitude changes to an SID should require transponder code and those changes to be read back.
Original NASA ASRS Text
Title: DEPARTING FLT GIVEN CLRNC WITH ACKNOWLEDGEMENT BY TRANSPONDER CODE ONLY. ON SID AT 4000' MSL DEP CTLR ADVISED FLT SHOULD HAVE BEEN AT 3000'.
Narrative: CLRNC WAS IAH 4 DEP WITH AN INITIAL LEVEL OFF ALT OF 400' MSL. ON READBACK WE READ ONLY THE XPONDER CODE WHICH WAS ACKNOWLEDGED BY CLRNC DELIVERY. AFTER TKOF ACFT WAS LEVELED AT 4000'. DEP CTL SAID WE WERE ONLY CLRED TO 3000', WHICH WE DID NOT HEAR IN THE ORIGINAL CLRNC OR ANY SUBSEQUENT CLRNC. ATC REQUESTS READBACK OF ONLY XPONDER CODE IN CLRNC. ANY ALT CHANGES TO AN SID SHOULD REQUIRE XPONDER CODE AND THOSE CHANGES TO BE READ BACK.
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.