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ASW, 5/10, P. 63 ONRECORD Mode Mixup An A320 continued descending after the flight crew initiated a go-around at decision height. BY MARK LACAGNINA The following information provides an aware- but, instead, performed a procedure called a ness of problems in the hope that they can be “TOGA tap,” which involves moving the thrust avoided in the future. The information is based levers briefly into the TOGA detent and then on final reports by official investigative authori- back to the maximum climb power detent. ties on aircraft accidents and incidents. However, in this incident, the thrust levers did not reach the TOGA detent before they were JETS moved back to the climb detent. The PIC said that he heard and felt a thrust ‘TOGA Tap’ Was Ineffective increase, and noticed an apparent increase in Airbus A320-232. No damage. No injuries. pitch attitude, but did not hear the expected an- efore departing from Christchurch, New nouncement by the copilot that a positive rate of Zealand, the morning of July 21, 2007, the climb had been achieved. Bflight crew was aware that fog might pre- At this point, the go-around procedure effec- vent them from landing at Melbourne, Victoria, tively came to a halt, eliminating a timely check Australia, and “had planned accordingly,” said of the flight modes indicated on the primary the Australian Transport Safety Bureau (ATSB) flight display (PFD), the report said. in a report published in February. Checking and announcing the flight modes As the aircraft neared Melbourne and was are among the actions that Airbus requires sequenced for an instrument landing system to be completed simultaneously when a (ILS) approach to Runway 27, the crews of “a go-around is initiated. However, the opera- number” of preceding aircraft conducted missed tor of the A320 had changed the go-around approaches, the report said. procedure, moving the flight-modes actions The A320 pilot-in-command (PIC), the pilot “to a much later position in the procedure,” flying, conducted the ILS approach with the au- the report said. Confirming and announcing a topilots and autothrottles engaged. “At the deci- positive rate of climb were among the actions sion height, the crew did not have the prescribed preceding the flight modes check and callout visual reference to continue the approach to on the operator’s revised checklist. land and commenced a missed approach,” As a result, the crew did not notice that, the report said. “During the initial part of the because of the PIC’s incomplete TOGA tap, the missed approach, the PIC did not correctly autopilots remained engaged in the glideslope move the thrust levers to the ‘takeoff/go-around’ and localizer modes. [TOGA] position, and, as a result, the aircraft’s The copilot said he noticed that the aircraft automated flight mode did not transition cor- continued to descend after the PIC announced rectly to the go-around mode.” the go-around. “Although aware of the require- The pilot told investigators that, because the ment to alert the pilot flying of the continuing aircraft was light, he did not select TOGA power descent, the copilot was momentarily unable to WWW.FLIGHTSAFETY.ORG | AEROSAFETYWORLD | MAY 2010 | 57 ONRECORD recall the correct phrase to be used,” the report takeoff from Runway 18L at Intersection A, said, noting that the correct phrase is “sink rate.” which is about 2,500 ft (762 m) from the ap- Not hearing the expected “positive rate” proach end of the runway. callout and not seeing the flight director pitch- According to the report by the U.S. Na- command bars rise on the PFD, the PIC “was tional Transportation Safety Board (NTSB), the unsure of the status of the aircraft,” the report ground air traffic controller had told the local The A320 was said. “[He] subsequently moved the thrust levers air traffic controller that the PC-12 pilot had re- to the correct position [the TOGA detent], the quested the intersection departure. The ground within 38 ft of the flight mode transitioned to the go-around phase, controller had also noted this on the PC-12’s ground when it and the aircraft responded normally.” flight progress strip and had circled the notation The A320 was within 38 ft of the ground in red, per procedure. began to climb. when it began to climb — 48 seconds after the The report said that the local controller PIC’s incomplete TOGA tap. forgot the verbal briefing by the ground control- The crew conducted another ILS approach ler, did not scan the flight progress strip, did not and an uneventful missed approach before check the PC-12’s position on the airport sur- diverting the flight to Avalon Airport, near face detection equipment (ASDE) display and Geelong, Victoria, where the aircraft was landed did not visually scan the runway to ensure that without further incident. it was clear of traffic before clearing the PC-12 The report said that the aircraft opera- crew for the intersection takeoff — four seconds tor had not analyzed the risks of changing the after clearing the CRJ crew for takeoff. go-around procedure before issuing the revised When the PC-12 entered the runway, the checklist. Its safety management system (SMS) ASDE generated an aural alert: “Warning, Run- did not require formal risk analyses of changes way 18L occupied.” The local controller then ra- to company policies or procedures. dioed the CRJ crew to “cancel takeoff clearance.” “As a result of this occurrence, the aircraft op- However, the CRJ crew had observed the PC- erator changed its go-around procedure to reflect 12 moving toward the runway and had initiated a that of the aircraft manufacturer and [changed] rejected takeoff at about 85 kt, after rolling about its SMS to require a formal risk management 1,600 ft (488 m). The PC-12 pilot taxied the process in support of any proposal to change an airplane to the left side of the runway when he aircraft operating procedure,” the report said. “recognized what was happening,” the report said. The incident also prompted Airbus to The PIC of the CRJ told investigators that “enhance its published go-around procedures to the airplane came to a stop on the runway cen- emphasize the critical nature of the flight crew terline about 3 ft (1 m) from the PC-12. He said actions during a go-around,” the report said. that a collision had been avoided because the PC-12 had “stayed left of the centerline.” Near Collision at an Intersection Bombardier CRJ200, Pilatus PC-12. No damage. No injuries. ‘Saw a Man Riding a Lawn Mower’ isual meteorological conditions (VMC) Boeing 757-200. No damage. No injuries. prevailed at Charlotte (North Carolina, et weather conditions had hindered VU.S.)/Douglas International Airport the grass-cutting operations at Dublin morning of May 29, 2009. Air traffic control W(Ireland) Airport, and it had become (ATC) had instructed the flight crew of the imperative to mow tall grass near the localizer CRJ200, which had 46 people aboard, to line antenna and approach lights for Runway 10. up on the approach end of Runway 18L and to Surface winds were forecast to favor that runway await clearance for takeoff. for an extended period, so airport and ATC The pilot of the PC-12, a single-turboprop authorities arranged to have the mowing done with three people aboard, was holding for the night of May 29, 2009. 58 | FLIGHT SAFETY FOUNDATION | AEROSAFETYWORLD | MAY 2010 ONRECORD Mowing at night is preferred because “cut- “The driver of the [T3] mower was unaware ting close to an active runway during the hours that an aircraft was arriving until he heard it on of daylight is highly problematic due to the the runway behind him,” the report said. The intensity of aircraft movements,” said the report 757 had touched down at 0252 and as it passed by the Irish Air Accident Investigation Unit by the mower, the copilot told the AMC that (AAIU). there was ground equipment on the runway. The driver of a four-wheel vehicle super- “I don’t believe it,” the AMC said. “They guar- vised the operators of three mowing vehicles. anteed me that they were clear of the runway.” The supervisor was able to monitor the local “Could have sworn I saw a man riding a and ground ATC radio frequencies, and to com- lawn mower,” the copilot said. municate with the controllers via a mobile tele- After the serious incident, the Dublin Airport phone. The supervisor and the mowing vehicle Authority complied with an AAIU recommen- operators communicated with each other via dation to ensure that all vehicles operating on hand-held radios set to a discrete frequency. or near active runways be equipped with radios At 0247 local time, the air movements con- capable of monitoring ground and local ATC fre- troller (AMC) told the supervisor to discontinue quencies, flashing yellow lights and transponders mowing operations because of decreasing vis- compatible with the airport’s advanced surface ibility and to report when all the vehicles were movement guidance and control system. clear of the field. The supervisor radioed the mowing vehicle Wing Scraped in Crosswind Landing operators to return to the maintenance base, Airbus A320-211. Minor damage. No injuries. which is on the south side of the airport. He reezing rain caused a two-hour delay in the told investigators that he instructed the opera- A320’s departure from Munich, Germany, tor of mowing vehicle T3, which was near the Ffor a scheduled flight with 132 passengers approach end of Runway 10, to “clear the field” and five crewmembers to Hamburg the after- and use the airport’s south perimeter road to noon of March 1, 2008.
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