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only if you obtain prior approval from other affected
positions or sectors within your facility and, if
necessary, from the adjacent facility concerned.
d. For aircraft operational limitations, take this
action only if the pilot informs you the available
appropriate altitude exceeds the operational limitations
of his/her aircraft and only after you obtain prior
approval from other affected positions or sectors
within your facility and, if necessary, from the
adjacent facility concerned.
e. For mission requirements, take this action only
when the aircraft is operating on an MTR.
REFERENCEFAAO
JO 7110.65, Para 7-7-5, Altitude Assignments.
FAAO JO 7110.65, Para 9-3-2, Separation Minima.
4-5-4. LOWEST USABLE FLIGHT LEVEL
If a change in atmospheric pressure affects a usable
flight level in your area of jurisdiction, use
TBL 4-5-2 to determine the lowest usable flight
level to clear aircraft at or above 18,000 feet MSL.
TBL 4-5-2
Lowest Usable FL
Altimeter Setting Lowest Usable FL
29.92” or higher 180
29.91” to 28.92” 190
28.91” to 27.92” 200
REFERENCEFAAO
JO 7110.65, Para 9-3-2, Separation Minima.
4-5-5. ADJUSTED MINIMUM FLIGHT
LEVEL
When the prescribed minimum altitude for IFR
operations is at or above 18,000 feet MSL and the
atmospheric pressure is less than 29.92”, add the
appropriate adjustment factor from TBL 4-5-3 to the
flight level equivalent of the minimum altitude in feet
to determine the adjusted minimum flight level.
TBL 4-5-3
Minimum FL Adjustment
Altimeter Setting Adjustment Factor
29.92” or higher None
29.91” to 29.42” 500 feet
29.41” to 28.92” 1,000 feet
28.91” to 28.42” 1,500 feet
28.41” to 27.92” 2,000 feet
4-5-6. MINIMUM EN ROUTE ALTITUDES
Except as provided in subparas a and b below, assign
altitudes at or above the MEA for the route segment
being flown. When a lower MEA for subsequent
segments of the route is applicable, issue the lower
MEA only after the aircraft is over or past the
Fix/NAVAID beyond which the lower MEA applies
unless a crossing restriction at or above the higher
MEA is issued.
2/14/08 JO 7110.65S
Altitude Assignment and Verification 4-5-3
a. An aircraft may be cleared below the MEA but
not below the MOCA for the route segment being
flown if the altitude assigned is at least 300 feet above
the floor of controlled airspace and one of the
following conditions are met:
NOTEControllers
must be aware that in the event of radio
communications failure, a pilot will climb to the MEA for
the route segment being flown.
1. Nonradar procedures are used only within
22miles of a VOR, VORTAC, or TACAN.
2. Radar procedures are used only when an
operational advantage is realized and the following
actions are taken:
(a) Radar navigational guidance is provided
until the aircraft is within 22 miles of the NAVAID,
and
(b) Lost communications instructions are
issued.
b. An aircraft may be cleared to operate on jet
routes below the MEA (but not below the prescribed
minimum altitude for IFR operations) or above the
maximum authorized altitude if, in either case, radar
service is provided.
NOTEMinimum
en route and maximum authorized altitudes for
certain jet route segments have been established above the
floor of the jet route structure due to limitations on
navigational signal coverage.
c. Where a higher altitude is required because of an
MEA, the aircraft shall be cleared to begin climb to
the higher MEA as follows:
1. If no MCA is specified, prior to or
immediately after passing the fix where the higher
MEA is designated. (See FIG 4-5-1.)
FIG 4-5-1
No MCA Specified
2. If a MCA is specified, prior to the fix so as to
cross the fix at or above the MCA. (See FIG 4-5-2.)
FIG 4-5-2
MCA Specified
d. Where MEAs have not been established, clear
an aircraft at or above the minimum altitude for IFR
operations prescribed by 14 CFR Section 91.177.
REFERENCEFAAO
JO 7110.65, Para 4-2-8, IFR‐VFR and VFR‐IFR Flights.
FAAO JO 7110.65, Para 4-4-1, Route Use.
FAAO JO 7110.65, Chapter 5, Section 6, Para 5-6-1, Application.
FAAO JO 7110.65, Para 7-7-5, Altitude Assignments.
4-5-7. ALTITUDE INFORMATION
Issue altitude instructions as follows:
REFERENCEFAAO
JO 7110.65, Para 4-2-1, Clearance Items.
a. Altitude to maintain or cruise. When issuing
cruise in conjunction with an airport clearance limit
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