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from the DER. The initial climb area width at
2 NM is ± 3,756 feet from centerline. After the
initial splay to the Initial Departure Fix (IDF) a
smaller splay continues until reaching a
terminal width as small as 2 NM at 10.89 NM
from the DER.
The horizontal alarm limit (HAL) is ±1 NM
within 30 NM of the airport reference point
(ARP).
CDI ±1/2 FSD (scale ±5 NM).
The airway primary width is ±4 NM
from centerline at 30 NM from the
airport reference point (ARP).
The HAL is ±2 NM for distances
greater than 30 NM from the ARP.
CDI ±3/4 FSD (scale ±1 NM
within 30 NM of the ARP).
For arrivals, the terminal primary
width is ±2 NM from centerline at
approximately 30 NM from the
ARP.
The HAL is ±1 NM within 30 NM
of the ARP.
CDI ±3/4 FSD (scale ±2 NM).
The airway primary width is ±4 NM
from centerline (equivalent to 2
RNP) at approximately 30 NM from
the ARP.
The HAL in the en route mode is 2
NM.
CDI ±3/4 FSD (scale ±1 NM
within 30 NM of the ARP).
For arrivals the terminal primary
width is ±2 NM from centerline at
approximately 30 NM from the
ARP.
The HAL in the terminal mode is 1
NM. The terminal mode begins at
30 NM from the ARP or at the
initial approach fix (IAF) when
more than 30 NM from the ARP.
Figure B-5. Continued
B-9
Phase of Flight
FINAL APPROACH MISSED APPROACH HOLDING
CDI ±2/3 FSD (scale ±0.3 NM).
For conventional GPS approaches the primary width is ±1.0 NM
from centerline at the FAF and tapers to ±0.5 NM at the MAP.
CDI ±1/3 FSD for “Copter” approaches (scale ±0.3 NM).
For “Copter” approaches the primary width is ± 0.55 NM from
centerline at the FAF and tapers to ±0.4 NM at the MAP.
The HAL is ±0.3 NM on the final approach segment (FAS).
NOTE: GPS C129 – Class C1 (FMS equipped) Flight
Director/Autopilot required since 1.0 NM scaling on the CDI is used.
For Airplane approaches CDI ±1/5 FSD and for Copter approaches
CDI ± 1/10 FSD (scale ±1.0 NM).
CDI ±3/4 FSD (scale ±1.0 NM).
For missed approaches the
primary width at the MAP is 0.5
NM and splays to ±4.0 NM from
centerline at 15 NM from the MAP.
For Copter approaches CDI ±1/2
FSD (scale ±1.0 NM). For missed
approaches the primary width at
the MAP is ±0.4 NM and splays to
±1.5 NM from centerline at 7.5 NM
from the MAP.
The HAL is ±1.0 NM within 30 NM
of the ARP.
Terminal (within 30 NM of the
ARP). CDI ±3/4 FSD (scale
±1.0 NM).
En route (more than 30 NM
from the ARP) CDI ±1/2 FSD
(scale ±5.0 NM).
The HAL for terminal holding is
±1.0 NM within 30 NM of the
ARP and ±2 NM when more
than 30 NM from the ARP.
CDI ±3/4 FSD lateral and vertical (LPV scale is ±2 degrees or ±0.3 NM
FSD at the FAF whichever is less. Nonprecision scale is ±0.3 NM).
LPV/LNAV approaches are similar to ILS/LOC approaches.
LNAV (nonprecision): The CDI scaling for not vectored to final
(VTF) approaches starts out with a linear width of ±1 NM FSD on
the intermediate segment. At 2 NM prior to the FAF the scaling
begins a change to either an angular ±2 degrees taper or ±0.3 NM
FSD whichever is smaller. This change must be completed at the
FAF. At the landing threshold point (LTP) the angular scale then
becomes linear again with a width of approximately ±350 feet from
centerline. For VTF approaches the CDI scaling starts out linear at
±1 NM FSD and changes to a ±2 degrees taper FSD and then
becomes linear again with a width of approximately 350 feet from
centerline at the LTP.
Approaching the runway, a LPV nominal 3 degrees glidepath starts
out linear (±150 M FSD) and then approximately 6 NM from the
landing threshold becomes angular at a width of ±0.75 degrees
and then becomes linear again as early as approximately 1.9 NM
from the GPI for a ±45 M FSD or as small as a ±15 M FSD at a
distance of approximately 0.6 NM from the landing threshold
(depending on the manufacturer).
The normal length of final is 5.0 NM from the threshold. The final
approach obstacle clearance area width at the FAF is approximately ±4,000 feet from centerline and tapers to ±700 feet from
centerline 200 feet from the runway threshold.
　
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