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based on piloted cab simulations at an adverse loading condition using normal piloting
techniques. Both all engines operating and engine out landings were considered. As
above, the published crosswinds were selected to provide adequate airplane control.
21. What is the difference between the crosswind guidelines and the demonstrated crosswind data in
the airplane flight manual?
<Answer>. The AFM "demonstrated" value is simply the highest crosswind conditions that were
encountered during the airplane flight test program. The recommended crosswind limits
were determined by analysis and piloted simulator evaluation, not by flight test.
22. Were the evaluations based on both takeoff and landing?
<Answer>. As described in the answer to Q20, piloted cab simulations were used in determining both
the takeoff and landing crosswind guidelines. The crosswind guidelines are different
because different maneuvers were considered for takeoff and landing.
23. Are these "theoretical" numbers?
<Answer>. The crosswind guidelines are not “theoretical” numbers. The crosswind guidelines are
based on piloted cab simulations where the simulator aerodynamic, thrust, and ground
2004 Flight Operations Symposium Questions 8/23/2004 10:19 AM
May 9 – 12, 2004, Bell Harbor Convention Center
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models are based on flight test data. The crosswind guidelines represent a conservative
assessment of the steady state crosswind.
24. Are the crosswind guidelines based on engine out?
<Answer>. The takeoff crosswind guidelines are based on an engine out refused takeoff maneuver
with an engine failure just before V1. The landing crosswind guidelines considered
engine out landings and recommend that the landing crosswind guidelines be reduced by
5 knots on wet and contaminated runways when using asymmetric reverse thrust.
25. MTH - What is the minimum recommended runway width for operations in crosswind?
<Answer>. The minimum width is 45 meters. Boeing has provided narrow runway crosswind and
takeoff speed and field length adjustment information to operators based on specific
requests.
Flight Crew Use of Circuit Breakers:
26. How will Boeing send this revised circuit breaker cycling policy for a dual FMC lockup out to the
fleets?
<Answer>. If internally approved in Boeing Flight Operations, Boeing would issue an Operations
Manual Bulletin to 757/767 operators advising of the revised policy for circuit breaker
use.
27. Operators need a list of circuit breakers (e.g., FMC, ACARS) that are acceptable to cycle.
<Answer>. Boeing may allow circuit breaker cycling via an operations manual bulletin on a case-bycase
basis to grant temporary relief from a known system anomaly. There will not be a
blanket recommendation or the establishment of a general policy. Please note the
distinction between cycling and resetting of circuit breakers. Recommendations
concerning circuit breaker resetting are already provided in the manuals. That policy is
not changing.
28. Why is Boeing concerned about cycling of circuit breakers? What about circuit breaker cycling
for the “Connexion by Boeing” system?
<Answer>. Flight crews are not trained in circuit breaker location or use. In many cases, circuit
breakers are installed in different locations on different airplanes within a model. Circuit
breakers are not designed to be switches; this impacts life expectancy of the circuit
breaker. The flight crew is not always in a position to easily reach circuit breakers. In
addition, the circuit breakers themselves are not necessarily clearly and uniformly
labeled. Boeing is also concerned that if the crew becomes habitualized to using circuit
breakers they will eventually use them in a situation they should not use them.
2004 Flight Operations Symposium Questions 8/23/2004 10:19 AM
May 9 – 12, 2004, Bell Harbor Convention Center
Page 6 of 15
29. We need this ops manual bulletin, with respect to recovering a locked out FMC, in every
operator’s operations manual.
<Answer>. Boeing Flight Operations will review the Boeing circuit breaker policy as it applies to the
FMC lockup failure mode(s). Any approved change in policy will be disseminated, as
appropriate, to affected operators.
30. Will there be similar language regarding cycling circuit breakers in the QRH procedures?
<Answer>. No, such information would only be issued as an Ops Manual bulletin as it would be only
temporary in nature. Our intent, as with all system malfunctions, is to permanently
correct the problem necessitating cycling of C/B’s.
31. Will cycling circuit breakers shutdown other systems?
　
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