BendixKing KLN 89B - Pilots Guide - Manual (Page 96)

2. Use the right inner knob to update
the altimeter baro setting (figure 3-
171).
Line 3 displays the Minimum Safe
Altitude (MSA)
IMPORTANT: The minimum safe altitude displayed is the altitude
defined by Jeppesen as “Grid Minimum Off-Route Altitude (Grid
MORA)”. This altitude is derived by Jeppesen for sectors which are
one degree of latitude by one degree of longitude in size. One degree
of latitude is 60 nautical miles. One degree of longitude is 60 nautical
miles at the equator and progressively less than 60 nautical miles as
one travels away from the equator. One degree of longitude is approx-
imately 50 nautical miles at the southern most parts of the U.S. and is
approximately 40 nautical miles at the northern most parts of the U.S.
The MSA altitude information is contained in the data base and is
updateed when the data base cartridge is updated.
The minimum safe altitude (MSA) provides “reference point” clearance
within these one degree latitude by one degree longitude sectors.
Jeppesen defines a reference point as “a natural (Peak, Knoll, Hill, etc.)
or man-made (Tower, Stack, Tank, Building, etc.) object”. Jeppesen
states the following about the Grid Minimum Off-Route altitude: “Grid
MORA values clear all reference points by 1000 feet in areas where
the highest reference points are 5000 feet MSL or lower. MORA values
clear all reference points by 2000 feet in areas where the highest refer-
ence points are 5001 feet MSL or higher”. The KLN 89(B) displays
dashes for areas outside the data base coverage area or for areas
where the Grid MORA is not defined.
Line 4 displays the Minimum Enroute Safe Altitude (ESA).
IMPORTANT: When the KLN 89(B) is in the Leg mode, the minimum
enroute safe altitude is the highest MSA sector altitude from the pre-
sent position to the active waypoint, then to the destination waypoint
along the active flight plan. See figure 3-172. When the KLN 89(B) is in
KLN 89/KLN 89B Pilot’s Guide Basic GPS Operation
3-59
Basic GPS Operation
Chapter 3
APT VOR NDB INT USR ACT NAV FPL CAL SET OTH
åå.ånm| BARO: 30.12"
ееееее|
Leg| MSA 3200ft
*CRSR*| ESA 5600ft
Figure 3-171
MSA (MSL)
ESA (MSL)
1° LONG.
1°
LAT.
Figure 3-172