luckydog
February 25th, 2009, 15:43
> *Subject:* New Twist in Continental Express Flight 3407
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> Southwest just sent this to their pilots yesterday in
> regard to the approach
> in Buffalo..
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> *"There is a potentially significant hazard concerning
> the ILS to runway 23
> in BUF.*
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> *Information has been received indicating it is possible to
> obtain a
> significant nose pitch up, in some cases as much as 30
> degrees, if the glide
> slope is allowed to capture before established on
> centerline. Pilots who are
> preparing to configure and land have the potential to
> experience abrupt
> pitch up, slow airspeed, and approach to stall if
> conditions present
> themselves in a certain manner.*
> *This effect is the result of an earthen obstruction close
> enough to the ILS
> to affect the integrity of the glide slope signal. This has
> resulted in the
> issuance of an advisory given on ATIS which states that
> "the ILS Glide Slope
> for runway 23 is unusable beyond 5 degrees right of
> course." When attempting
> to intercept the runway 23 ILS from right traffic, the ILS
> glide slope
> indication may read full deflection down. Just prior to
> intercept it may
> then move up in such
> as manner as to enable approach mode to capture in such a
> way as to result
> in a nose up pitch and loss of airspeed. Southwest Airlines
> has issued a
> notice reading: "Until further notice, when executing
> the KBUF ILS/LOC
> Runway 23, DO NOT select Approach Mode until established on
> the localizer
> inbound."*
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>
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>
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>
>
> Southwest just sent this to their pilots yesterday in
> regard to the approach
> in Buffalo..
>
>
>
>
>
>
>
>
>
>
>
> *"There is a potentially significant hazard concerning
> the ILS to runway 23
> in BUF.*
>
>
>
>
>
>
> *Information has been received indicating it is possible to
> obtain a
> significant nose pitch up, in some cases as much as 30
> degrees, if the glide
> slope is allowed to capture before established on
> centerline. Pilots who are
> preparing to configure and land have the potential to
> experience abrupt
> pitch up, slow airspeed, and approach to stall if
> conditions present
> themselves in a certain manner.*
> *This effect is the result of an earthen obstruction close
> enough to the ILS
> to affect the integrity of the glide slope signal. This has
> resulted in the
> issuance of an advisory given on ATIS which states that
> "the ILS Glide Slope
> for runway 23 is unusable beyond 5 degrees right of
> course." When attempting
> to intercept the runway 23 ILS from right traffic, the ILS
> glide slope
> indication may read full deflection down. Just prior to
> intercept it may
> then move up in such
> as manner as to enable approach mode to capture in such a
> way as to result
> in a nose up pitch and loss of airspeed. Southwest Airlines
> has issued a
> notice reading: "Until further notice, when executing
> the KBUF ILS/LOC
> Runway 23, DO NOT select Approach Mode until established on
> the localizer
> inbound."*