Appendix G to Part 91 - Operations
in Reduced Vertical Separation Minimum (RVSM) Airspace
Section 1. Definitions
Reduced Vertical Separation Minimum (RVSM) Airspace. Within RVSM
airspace, air traffic control (ATC) separates aircraft by a minimum of
1,000 feet vertically between flight level (FL) 290 and FL 410 inclusive.
RVSM airspace is special qualification airspace; the operator and the
aircraft used by the operator must be approved by the Administrator.
Air-traffic control notifies operators of RVSM by providing route planning
information. Section 8 of this appendix identifies airspace where RVSM may
be applied.
RVSM Group Aircraft. Aircraft within a group of aircraft,
approved as a group by the Administrator, in which each of the aircraft
satisfy each of the following:
(a) The aircraft have been manufactured to the same design, and have
been approved under the same type certificate, amended type certificate,
or supplemental type certificate.
(b) The static system of each aircraft is installed in a manner and
position that is the same as those of the other aircraft in the group. The
same static source error correction is incorporated in each aircraft of
the group.
(c) The avionics units installed in each aircraft to meet the minimum
RVSM equipment requirements of this appendix are:
(1) Manufactured to the same manufacturer specification and have the
same part number; or
(2) Of a different manufacturer or part number, if the applicant
demonstrates that the equipment provides equivalent system performance.
RVSM Nongroup Aircraft. An aircraft that is approved for RVSM
operations as an individual aircraft.
RVSM Flight envelope. An RVSM flight envelope includes the range
of Mach number, weight divided by atmospheric pressure ratio, and
altitudes over which an aircraft is approved to be operated in cruising
flight within RVSM airspace. RVSM flight envelopes are defined as follows:
(a) The full RVSM flight envelope is bounded as follows:
(1) The altitude flight envelope extends from FL 290 upward to the
lowest altitude of the following:
(i) FL 410 (the RVSM altitude limit);
(ii) The maximum certificated altitude for the aircraft; or
(iii) The altitude limited by cruise thrust, buffet, or other flight
limitations.
(2) The airspeed flight envelope extends:
(i) From the airspeed of the slats/flaps-up maximum endurance (holding)
airspeed, or the maneuvering airspeed, whichever is lower;
(ii) To the maximum operating airspeed (Vmo/Mmo),
or airspeed limited by cruise thrust buffet, or other flight limitations,
whichever is lower.
(3) All permissible gross weights within the flight envelopes defined
in paragraphs (1) and (2) of this definition.
(b) The basic RVSM flight envelope is the same as the full RVSM
flight envelope except that the airspeed flight envelope extends:
(1) From the airspeed of the slats/flaps-up maximum endurance (holding)
airspeed, or the maneuver airspeed, whichever is lower;
(2) To the upper Mach/airspeed boundary defined for the full RVSM
flight envelope, or a specified lower value not less than the long-range
cruise Mach number plus .04 Mach, unless further limited by available
cruise thrust, buffet, or other flight limitations.
Section 2. Aircraft Approval
(a) An operator may be authorized to conduct RVSM operations if the
Administrator finds that its aircraft comply with this section.
(b) The applicant for authorization shall submit the appropriate data
package for aircraft approval. The package must consist of at least the
following:
(1) An identification of the RVSM aircraft group or the nongroup
aircraft;
(2) A definition of the RVSM flight envelopes applicable to the subject
aircraft;
(3) Documentation that establishes compliance with the applicable RVSM
aircraft requirements of this section; and
(4) The conformity tests used to ensure that aircraft approved with the
data package meet the RVSM aircraft requirements.
(c) Altitude-keeping equipment: All aircraft. To approve an
aircraft group or a nongroup aircraft, the Administrator must find that
the aircraft meets the following requirements:
(1) The aircraft must be equipped with two operational independent
altitude measurement systems.
(2) The aircraft must be equipped with at least one automatic altitude
control system that controls the aircraft altitude --
(i) Within a tolerance band of ±65 feet about an acquired altitude when
the aircraft is operated in straight and level flight under nonturbulent,
nongust conditions; or
(ii) Within a tolerance band of ±130 feet under nonturbulent, nongust
conditions for aircraft for which application for type certification
occurred on or before April 9, 1997 that are equipped with an automatic
altitude control system with flight management/performance system inputs.
(3) The aircraft must be equipped with an altitude alert system that
signals an alert when the altitude displayed to the flight crew deviates
from the selected altitude by more than:
(i) ±300 feet for aircraft for which application for type certification
was made on or before April 9, 1997; or
(ii) ±200 feet for aircraft for which application for type
certification is made after April 9, 1997.
(d) Altimetry system error containment: Group aircraft for which
application for type certification was made on or before April 9, 1997.
To approve group aircraft for which application for type certification was
made on or before April 9, 1997, the Administrator must find that the
altimetry system error (ASE) is contained as follows:
(1) At the point in the basic RVSM flight envelope where mean ASE
reaches its largest absolute value, the absolute value may not exceed 80
feet.
(2) At the point in the basic RVSM flight envelope where mean ASE plus
three standard deviations reaches its largest absolute value, the absolute
value may not exceed 200 feet.
(3) At the point in the full RVSM flight envelope where mean ASE
reaches its largest absolute value, the absolute value may not exceed 120
feet.
(4) At the point in the full RVSM flight envelope where mean ASE plus
three standard deviations reaches its largest absolute value, the absolute
value may not exceed 245 feet.
(5) Necessary operating restrictions. If the applicant
demonstrates that its aircraft otherwise comply with the ASE containment
requirements, the Administrator may establish an operating restriction on
that applicant's aircraft to restrict the aircraft from operating in areas
of the basic RVSM flight envelope where the absolute value of mean ASE
exceeds 80 feet, and/or the absolute value of mean ASE plus three standard
deviations exceeds 200 feet; or from operating in areas of the full RVSM
flight envelope where the absolute value of the mean ASE exceeds 120 feet
and/or the absolute value of the mean ASE plus three standard deviations
exceeds 245 feet.
(e) Altimetry system error containment: Group aircraft for which
application for type certification is made after April 9, 1997. To
approve group aircraft for which application for type certification is
made after April 9, 1997, the Administrator must find that the altimetry
system error (ASE) is contained as follows:
(1) At the point in the full RVSM flight envelope where mean ASE
reaches its largest absolute value, the absolute value may not exceed 80
feet.
(2) At the point in the full RVSM flight envelope where mean ASE plus
three standard deviations reaches its largest absolute value, the absolute
value may not exceed 200 feet.
(f) Altimetry system error containment: Nongroup aircraft. To
approve a nongroup aircraft, the Administrator must find that the
altimetry system error (ASE) is contained as follows:
(1) For each condition in the basic RVSM flight envelope, the largest
combined absolute value for residual static source error plus the avionics
error may not exceed 160 feet.
(2) For each condition in the full RVSM flight envelope, the largest
combined absolute value for residual static source error plus the avionics
error may not exceed 200 feet.
(g) Traffic Alert and Collision Avoidance System (TCAS) Compatibility
With RVSM Operations: All aircraft. After March 31, 2002, unless otherwise
authorized by the Administrator, if you operate an aircraft that is
equipped with TCAS II in RVSM airspace, it must be a TCAS II that meets
TSO C-119b (Version 7.0), or a later version.
(h) If the Administrator finds that the applicant's aircraft comply
with this section, the Administrator notifies the applicant in writing.
Section 3. Operator Authorization
(a) Authority for an operator to conduct flight in airspace where RVSM
is applied is issued in operations specifications or a Letter of
Authorization, as appropriate. To issue an RVSM authorization, the
Administrator must find that the operator's aircraft have been approved in
accordance with Section 2 of this appendix and that the operator complies
with this section.
(b) An applicant for authorization to operate within RVSM airspace
shall apply in a form and manner prescribed by the Administrator. The
application must include the following:
(1) An approved RVSM maintenance program outlining procedures to
maintain RVSM aircraft in accordance with the requirements of this
appendix. Each program must contain the following:
(i) Periodic inspections, functional flight tests, and maintenance and
inspection procedures, with acceptable maintenance practices, for ensuring
continued compliance with the RVSM aircraft requirements.
(ii) A quality assurance program for ensuring continuing accuracy and
reliability of test equipment used for testing aircraft to determine
compliance with the RVSM aircraft requirements.
(iii) Procedures for returning noncompliant aircraft to service.
(2) For an applicant who operates under part 121 or 135, initial and
recurring pilot training requirements.
(3) Policies and Procedures. An applicant who operates under part 121
or 135 shall submit RVSM policies and procedures that will enable it to
conduct RVSM operations safely.
(c) Validation and Demonstration. In a manner prescribed by the
Administrator, the operator must provide evidence that:
(1) It is capable to operate and maintain each aircraft or aircraft
group for which it applies for approval to operate in RVSM airspace; and
(2) Each pilot has an adequate knowledge of RVSM requirements,
policies, and procedures.
Section 4. RVSM Operations
(a) Each person requesting a clearance to operate within RVSM airspace
shall correctly annotate the flight plan filed with air traffic control
with the status of the operator and aircraft with regard to RVSM approval.
Each operator shall verify RVSM applicability for the flight planned route
through the appropriate flight planning information sources.
(b) No person may show, on the flight plan filed with air traffic
control, an operator or aircraft as approved for RVSM operations, or
operate on a route or in an area where RVSM approval is required, unless:
(1) The operator is authorized by the Administrator to perform such
operations; and
(2) The aircraft has been approved and complies with the requirements
of Section 2 of this appendix.
Section 5. Deviation Authority Approval
The Administrator may authorize an aircraft operator to deviate from
the requirements of §91.706 for a specific flight in RVSM airspace if that
operator has not been approved in accordance with Section 3 of this
appendix, and if:
(2) The operator submits an appropriate request with the air traffic
control center controlling the airspace, (request should be made at least
48 hours in advance of the operation unless prevented by exceptional
circumstances); and
(b) At the time of filing the flight plan for that flight, ATC
determines that the aircraft may be provided appropriate separation and
that the flight will not interfere with, or impose a burden on, the
operations of operators who have been approved for RVSM operations in
accordance with Section 3 of this appendix.
Section 6. Reporting Altitude-Keeping Errors
Each operator shall report to the Administrator each event in which the
operator's aircraft has exhibited the following altitude-keeping
performance:
(a) Total vertical error of 300 feet or more;
(b) Altimetry system error of 245 feet or more; or
(c) Assigned altitude deviation of 300 feet or more.
Section 7. Removal or Amendment of Authority
The Administrator may amend operations specifications to revoke or
restrict an RVSM authorization, or may revoke or restrict an RVSM letter
of authorization, if the Administrator determines that the operator is not
complying, or is unable to comply, with this appendix or subpart H of this
part. Examples of reasons for amendment, revocation, or restriction
include, but are not limited to, an operator's:
(a) Committing one or more altitude-keeping errors in RVSM airspace;
(b) Failing to make an effective and timely response to identify and
correct an altitude-keeping error; or
(c) Failing to report an altitude-keeping error.
Section 8. Airspace Designation
(a) RVSM in the North Atlantic. (1) RVSM may be applied in the
NAT in the following ICAO Flight Information Regions (FIRs): New York
Oceanic, Gander Oceanic, Sondrestrom FIR, Reykjavik Oceanic, Shanwick
Oceanic, and Santa Maria Oceanic.
(2) RVSM may be effective in the Minimum Navigation Performance
Specification (MNPS) airspace within the NAT. The MNPS airspace within the
NAT is defined by the volume of airspace between FL 285 and FL 420
(inclusive) extending between latitude 27 degrees north and the North
Pole, bounded in the east by the eastern boundaries of control areas Santa
Maria Oceanic, Shanwick Oceanic, and Reykjavik Oceanic and in the west by
the western boundaries of control areas Reykjavik Oceanic, Gander Oceanic,
and New York Oceanic, excluding the areas west of 60 degrees west and
south of 38 degrees 30 minutes north.
(b) RVSM in the Pacific. (1) RVSM may be applied in the Pacific
in the following ICAO Flight Information Regions (FIRs): Anchorage Arctic,
Anchorage Continental, Anchorage Oceanic, Auckland Oceanic, Brisbane,
Edmonton, Honiara, Los Angeles, Melbourne, Nadi, Naha, Nauru, New Zealand,
Oakland, Oakland Oceanic, Port Moresby, Seattle, Tahiti, Tokyo, Ujung
Pandang and Vancouver.
(c) RVSM in the West Atlantic Route System (WATRS). RVSM may be
applied in the New York FIR portion of the West Atlantic Route System (WATRS).
The area is defined as beginning at a point 38°30&min; N/60°00&min;W
direct to 38°30&min;N/69°15&min; W direct to 38°20&min; N/69°57&min; W
direct to 37°31&min; N/71°41&min; W direct to 37°13&min; N/72°40&min; W
direct to 35°05&min; N/72°40&min; W direct to 34°54&min; N/72°57&min; W
direct to 34°29&min; N/73°34&min; W direct to 34°33&min; N/73°41&min; W
direct to 34°19&min; N/74°02&min; W direct to 34°14&min; N/73°57&min; W
direct to 32°12&min; N/76°49&min; W direct to 32°20&min; N/77°00&min; W
direct to 28°08&min; N/77°00&min; W direct to 27°50&min; N/76°32&min; W
direct to 27°50&min; N/74°50&min; W direct to 25°00&min; N/73°21&min; W
direct to 25°00&min;05&min; N/69°13&min;06&min; W direct to 25°00&min;
N/69°07&min; W direct to 23°30&min; N/68°40&min; W direct to 23°30&min;
N/60°00&min; W to the point of beginning.
[Doc. No. 28870, 62 FR 17487, Apr. 9, 1997, as amended by Amdt.
91-261, 65 FR 5942, Feb. 7, 2000; Amdt. 91-271, 66 FR 63895, Dec. 10,
2001]