Vmcl means
Join Date: Aug 2005
Location: Adelaide
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VMCL, the minimum control speed during landing approach with all
engines operating, is the calibrated airspeed at which, when the critical
engine is suddenly made inoperative, it is possible to maintain control of
the airplane with that engine still inoperative and maintain straight flight
with an angle of bank of not more than 5 degrees. VMCL must be established
with--
(1) The airplane in the most critical configuration for approach with all
engines operating;
(2) The most unfavorable center of gravity;
(3) The airplane trimmed for approach with all engines operating;
(4) The maximum sea level landing weight (or any lesser weight necessary to
show VMCL); and
(5) Maximum available takeoff power or thrust on the operating engines.
(g) For airplanes with three or more engines, VMCL-2, the minimum control
speed during landing approach with one critical engine inoperative, is the
calibrated airspeed at which, when a second critical engine is suddenly made
inoperative, it is possible to maintain control of the airplane with both
engines still inoperative and maintain straight flight with an angle of bank
of not more than 5 degrees. VMCL-2 must be established with--
(1) The airplane in the most critical configuration for approach with the
critical engine inoperative;
(2) The most unfavorable center of gravity;
(3) The airplane trimmed for approach with the critical engine inoperative;
(4) The maximum sea level landing weight (or any lesser weight necessary to
show VMCL-2);
(5) The power or thrust on the operating engines required to maintain an
approach path angle of 3 degrees when one critical engine is inoperative; and
(6) The power or thrust on the operating engines rapidly changed,
immediately after the second critical engine is made inoperative, from the
power or thrust prescribed in paragraph (g)(5) of this section to--
(i) Minimum available power or thrust; and
(ii) Maximum available takeoff power or thrust.
(h) The rudder control forces required to maintain control at VMCL and
VMCL-2 may not exceed 150 pounds, nor may it be necessary to reduce the power
or thrust of the operating engines. In addition, the airplane may not assume
any dangerous attitudes or require exceptional piloting skill, alertness, or
strength to prevent a divergence in the approach flight path that would
jeopardize continued safe approach when--
(1) The critical engine is suddenly made inoperative; and
(2) For the determination of VMCL-2, the power or thrust on the operating
engines is changed in accordance with paragraph (g)(6) of this section.
"http://adg.stanford.edu/aa241/stability/FAR143.html"
engines operating, is the calibrated airspeed at which, when the critical
engine is suddenly made inoperative, it is possible to maintain control of
the airplane with that engine still inoperative and maintain straight flight
with an angle of bank of not more than 5 degrees. VMCL must be established
with--
(1) The airplane in the most critical configuration for approach with all
engines operating;
(2) The most unfavorable center of gravity;
(3) The airplane trimmed for approach with all engines operating;
(4) The maximum sea level landing weight (or any lesser weight necessary to
show VMCL); and
(5) Maximum available takeoff power or thrust on the operating engines.
(g) For airplanes with three or more engines, VMCL-2, the minimum control
speed during landing approach with one critical engine inoperative, is the
calibrated airspeed at which, when a second critical engine is suddenly made
inoperative, it is possible to maintain control of the airplane with both
engines still inoperative and maintain straight flight with an angle of bank
of not more than 5 degrees. VMCL-2 must be established with--
(1) The airplane in the most critical configuration for approach with the
critical engine inoperative;
(2) The most unfavorable center of gravity;
(3) The airplane trimmed for approach with the critical engine inoperative;
(4) The maximum sea level landing weight (or any lesser weight necessary to
show VMCL-2);
(5) The power or thrust on the operating engines required to maintain an
approach path angle of 3 degrees when one critical engine is inoperative; and
(6) The power or thrust on the operating engines rapidly changed,
immediately after the second critical engine is made inoperative, from the
power or thrust prescribed in paragraph (g)(5) of this section to--
(i) Minimum available power or thrust; and
(ii) Maximum available takeoff power or thrust.
(h) The rudder control forces required to maintain control at VMCL and
VMCL-2 may not exceed 150 pounds, nor may it be necessary to reduce the power
or thrust of the operating engines. In addition, the airplane may not assume
any dangerous attitudes or require exceptional piloting skill, alertness, or
strength to prevent a divergence in the approach flight path that would
jeopardize continued safe approach when--
(1) The critical engine is suddenly made inoperative; and
(2) For the determination of VMCL-2, the power or thrust on the operating
engines is changed in accordance with paragraph (g)(6) of this section.
"http://adg.stanford.edu/aa241/stability/FAR143.html"
