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<Answer>. Boeing will investigate this when establishing recommendations on a case-by-case basis.
Yes, it is possible one system’s circuit breaker could disable all or part of another system.
757 Pilot Induced Oscillations (PIO):
32. Please confirm when the Wheel damper service bulletin will be available.
<Answer>. The wheel damper Service Bulletin will be released sometime in mid to late August,
2004.
33. Will vortex generators be mandated?
<Answer>. As of May, 2004, installation of flap vortilons are a 'planned AD' (reference: FAA
worksheet # 02-AD-166). This means that there is a very good chance that installation of
the vortilons will be mandated. Boeing recommends that all operators install the
vortilons.
34. If there are two (2) vortex generators missing will a flaps 25 landing be required? Why is this
requirement necessary if the airplane has been flying around for years without vortex generators?
<Answer>. Per the CDL, if more than one vortex generator is missing on either side, use of flaps 30
is prohibited and Flaps 25 landings will be required..
The vortilons, or vortex generators, are installed on the leading edge of the outboard flap
to remove an aerodynamic anomaly that could be a potential trigger for a lateral PIO.
They are designed to prevent a sudden air flow separation on the outboard flaps caused
by the spoilers deflecting. Thus, these vortilons will make lateral roll control authority
more linear and smooth and predictable with wheel position. This lateral aerodynamic
anomaly does not occur at flap detent positions other than 30.
The degree/level to which these vortilons prevent this premature separation is a function
of how many vortilons are on the flap leading edge and their location. An aircraft with
2004 Flight Operations Symposium Questions 8/23/2004 10:19 AM
May 9 – 12, 2004, Bell Harbor Convention Center
Page 7 of 15
different missing vortilon patterns left compared to right will exhibit different roll
characteristics left when compared to right. For this reason, the operator is prohibited
from using flaps 30 when more than one vortilon is missing on either side.
These vortilons are held in place by glue and rivets. It is unlikely they will depart the
airplane by working themselves loose while under air load and vibration. Their departure
most likely would be the result of something impacting the flap leading edge. In this
case, it is likely that there would be other structural damage to the leading edge of the
flap that would draw attention.
35. When will all service bulletins (for Vortex Generators) be available?
<Answer>. The vortilon Service Bulletin was originally released as a "SPECIAL ATTENTION"
Bulletin on 3/9/00. On 1/10/02, it was re-released as an "ALERT" Service Bulletin.
The wheel damper Service Bulletin will be released sometime in mid to late August,
2004.
36. Do the simulators reflect this PIO tendency?
<Answer>. Boeing does not think crew training simulators accurately represent the PIO
tendencies/proneness of our airplanes.
37. At what line number will the control wheel damper be implemented?
<Answer>. The first 757 to receive a wheel damper on the production line was line # 1039; a CAL
757-300 (NL106).
38. Have there been any reports of PIO’s on airplanes with the vortex generators installed?
<Answer>. Yes.
39. Which airplanes have vortillons installed?
<Answer>. Vortilons were installed in the factory for all 757-200s delivered on or after 2/3/00. The
vortilons are part of the 757-300 production configuration; so, all have them.
40. How many incidents of this have there been industry wide?
<Answer>. There have been thirteen (13) confirmed 757 lateral PIO events since early 1995.
41. Is the “revised rigging” a separate service bulletin?
<Answer>. No
2004 Flight Operations Symposium Questions 8/23/2004 10:19 AM
May 9 – 12, 2004, Bell Harbor Convention Center
Page 8 of 15
FMS Upgrade Summary Pegasus 2003:
42. Will the 737NG have the same Pegasus update?
<Answer>. The 737 has a different FMC altogether; the Smiths’ FMC (on 737NG) already had the
holding pattern entry/exit displayed.
43. The Ops Manual description of the FMC indicates that resets will only occur during single FMC
operation. They actually occur in dual FMC operations also. Is the Ops Manual going to be
updated to correct this?
<Answer>. Boeing is making a change to the system description information in the operations
manual to describe the fact that resets can occur during dual FMC operation.
43A. Have the power transfer problems that caused resets in the FMC been corrected in Peg 03?
　
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