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Old 5th January 2010 | 17:26
  #265 (permalink)  
IGh
 
Joined: May 2007
Posts: 257
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From: Castlegar
Low Energy Balked Ldg

Back in slot #250, dated 3rd, FS posed a sticky question:
"... when tight landing and stopping conditions are encountered in the civilian world ... both fixation to land and the need to go-around can co-exist in the same mind? Naval aviators do it all the time...."
Ya, but -- several civil mishaps point-out some weaknesses in civil TURBOJET design. Perhaps TC's Advisory Circular #0141 (13May98) said it best:
Advisory Circulars - Commercial & Business Aviation Advisory Circulars - Commercial and Business Aviation - Airlines & Aviation Operations - Air Transportation - Transport Canada
"... It is a common belief among pilots ... that aircraft are certified to successfully complete a balked landing or go-around from any point during the approach or landing phase. This is not the case. [see AC for Low Energy definition] ... The decision to place an aircraft into the low-energy landing regime is a decision to land. If there is any doubt regarding the probability of a safe landing, a go-around or balked landing must be initiated prior to entry into this regime.


"An attempt to commence a go-around or balked landing while in the low-energy landing regime is a high-risk, undemonstrated maneuver.

"In the extreme case where such action is required, pilots should be aware that ground contact is likely and any attempt to commence a climb before the engines have achieved go-around thrust may result in a stall. Turbo-fan engines may require as long as eight seconds to accelerate from idle to go-around thrust. Air operators should immediately ensure that their pilots are aware ..."
The NTSB has been incomplete in their analysis of this "energy management" aspect during prior ALA- investigations (see Board's botched investigation of DEN/21Mar06 ARC DEN06IA051 ). Tailwind approaches force the pilot back against the "energy management" element of the FAA's Stabilized Approach Concept: FAA's "spooled-up" requirement may not be attained with the tailwind. Board did little better during investigation of AA699/ 6Feb97
http://www.ntsb.gov/ntsb/brief.asp?ev_id=20001208X07395&key=1
which Board cited in their letter of Recommendations after the Rwy Excursion of AA1420/ 1Jun99.

Last edited by IGh; 5th January 2010 at 22:59.
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