BY ORDER OF THE SECRETARY OF THE AIR FORCE AIR FORCE ...

AFMAN 11-217V1 3 JANUARY 2005 309
14.2.2.2.2.11.3. Glide Slope Indicator. Prepare to intercept the glide slope
as the GSI moves downward from its upper limits. Determine the
approximate rate of descent to maintain the glide slope. The vertical
velocity required to maintain this angle of descent will be dependent upon
the aircraft groundspeed and the glide slope angle. Slightly before the GSI
reaches the center position, coordinate pitch and power control
adjustments to establish the desired rate of descent.
14.2.2.2.2.12. Pitch Adjustments. Pitch adjustments made in increments of 2°
or less will usually result in more precise glide slope control. As the approach
progresses, smaller pitch and bank corrections are required for a given
CDI/GSI deviation.
14.2.2.2.2.12.1. Over-Controlling. During the latter part of the approach,
pitch changes of 1° and heading corrections of 5° or less will prevent overcontrolling.
14.2.2.2.2.12.2. Steering Commands. If using pitch and bank steering
commands supplied by a flight director system, monitor basic flight data
(raw data) and aircraft performance instruments to ensure the desired
flight path is being flown and aircraft performance is within acceptable
limits. A common and dangerous error when flying an MLS approach
using a flight director is to concentrate only on the steering bars and
ignore other flight path and aircraft performance instruments. Failure of
the flight director computer (steering bars) may NOT always be
accompanied by the appearance of warning flags. Steering commands
must be correlated with flight path (CDI and GSI) and aircraft
performance instruments.
14.2.2.2.2.12.3. Crosscheck. Maintain a complete instrument crosscheck
throughout the approach, with increased emphasis on the altimeter during
the latter part (DH is determined by the barometric altimeter). Establish a
systematic scan for the runway environment prior to reaching DH. At DH,
if visual reference with the runway environment is established, continue
the approach to landing using flight instruments to complement the visual
reference.
14.2.2.2.2.12.4. WARNING: The MLS approach must be discontinued if
the course becomes unreliable, or any time full-scale deflection of the CDI
occurs on final approach. Do not descend below azimuth-only minimums
if the aircraft is more than one dot (half scale) below or two dots (full
scale) above the glide slope. If the glide slope is recaptured to within the
above tolerances, descent may be continued to DH.
14.2.2.2.2.12.5. NOTE: If making an autopilot-coupled approach or
landing, follow the aircraft flight manual procedures. When autopilot
coupled operations are to be conducted, advise the ATC approach
controller as soon as practical, but not later than the FAF. This will allow
time for the appropriate critical area to be cleared or an advisory issued.