functional FMS, incorrect transcription of ATC clearance or re-clearance, flight plan followed rather than ATC clearance, original clearance followed instead of re-clearance etc) ATC system loop error; (e.g. ATC issues incorrect D clearance or flight crew misunderstands clearance message) 5.00 34.00 2.00 1.17 Coordination errors in the ATC to ATC transfer or control responsibility as a result of human factors issues (e.g. late or non-existent coordination, E incorrect time estimate/actual, flight level, ATS route etc not in accordance with agreed parameters) 107.00 1017.00 0.00 23.48 Coordination errors in the ATC to ATC transfer or F control responsibility as a result of equipment outage or technical issues 0.00 0.00 0.00 0.00 Deviation due to aircraft contingency event leading to sudden inability to maintain assigned G flight level (e.g. pressurization failure, engine failure) 0.00 0.00 0.00 0.00 Deviation due to airborne equipment failure leading to unintentional or undetected change of H flight level 0.00 0.00 0.00 0.00 Deviation due to turbulence or other weather I related cause 2.00 29.00 0.00 0.67 Deviation due to TCAS resolution advisory, flight J crew correctly following the resolution advisory 0.00 0.00 0.00 0.00 Deviation due to TCAS resolution advisory, flight K crew incorrectly following the resolution advisory 0.00 0.00 0.00 0.00 An aircraft being provided with RVSM separation is not RVSM approved (e.g. flight plan indicating L RVSM approval but aircraft not approved, ATC misinterpretation of flight plan) 0.00 0.00 0.00 0.00 Other this includes situations of flights – operating (including climbing/descending) in airspace where flight crews are unable to establish M normal air-ground communications with the responsible ATS unit. 0.00 0.00 0.00 0.00 Total 115 1109.00 2.00 25.99 Summary of LHD by LHD Category for BOB Airspace Table 3:
functional FMS, incorrect transcription of ATC clearance or re-clearance, flight plan followed rather than ATC clearance, original clearance followed instead of re-clearance etc) D ATC system loop error; (e.g. ATC issues incorrect clearance or flight crew misunderstands clearance message) 5.00 34.00 2.00 1.17 E Coordination errors in the ATC to ATC transfer or control responsibility as a result of human factors issues (e.g. late or non-existent coordination, incorrect time estimate/actual, flight level, ATS route etc not in accordance with agreed parameters) 107.00 1017.00 0.00 23.48 F Coordination errors in the ATC to ATC transfer or control responsibility as a result of equipment outage or technical issues 0.00 0.00 0.00 0.00 G Deviation due to aircraft contingency event leading to sudden inability to maintain assigned flight level (e.g. pressurization failure, engine failure) 0.00 0.00 0.00 0.00 H Deviation due to airborne equipment failure leading to unintentional or undetected change of flight level 0.00 0.00 0.00 0.00 I Deviation due to turbulence or other weather related cause 2.00 29.00 0.00 0.67 J Deviation due to TCAS resolution advisory, flight crew correctly following the resolution advisory 0.00 0.00 0.00 0.00 K Deviation due to TCAS resolution advisory, flight crew incorrectly following the resolution advisory 0.00 0.00 0.00 0.00 L An aircraft being provided with RVSM separation is not RVSM approved (e.g. flight plan indicating RVSM approval but aircraft not approved, ATC misinterpretation of flight plan) 0.00 0.00 0.00 0.00 M Other – this includes situations of flights operating (including climbing/descending) in airspace where flight crews are unable to establish normal air-ground communications with the responsible ATS unit. 0.00 0.00 0.00 0.00 Total 115 1109.00 2.00 25.99 Table 3: Summary of LHD by LHD Category for BOB Airspace
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