(4) RVSM Equipment Requirements

(a)
Two independent altitude measurement systems. Each system should be composed of the following: cross coupled static source/system provided with ice protection; equipment for measuring static pressure and displaying pressure altitude to aircrew; equipment for digitally coding displayed pressure altitude for automatic altitude reporting purposes; static source error correction (SSEC) if needed to meet requirements; and reference signals for automatic control and alerting at selected altitude.

(b)
One Secondary Surveillance Radar (SSR) altitude reporting transponder. If only one is fitted, it should have the capability to operate from either altitude measurement system.

(c)
One altitude alert/warning system to signal crew if actual altitude deviates from selected altitude by a nominal value not greater than 300 feet (for aircraft certified after 1 Jan 1997, allowable deviation is 200 feet).

(d)
One automatic altitude-keeping device (flight director/autopilot system meeting RVSM tolerances of 65 feet).

(e)
Should any required equipment fail prior to entering RVSM airspace, the pilot shall request a new clearance so as to avoid flight in this airspace.

(5)
Flight Planning. During flight planning, the flight crew and dispatchers, if applicable shall pay particular attention to conditions which may affect operation in RVSM airspace. These include, but may not be limited to:

(a) Verifying the aircraft is approved for RVSM operations.
(b)
Annotating the flight plan to be filed with the Air Traffic Service Provider to show that the aircraft is approved for RVSM operations, or accounting for any aircraft operating restrictions related to RVSM airworthiness approval. Aircraft equipment (TD Code) suffixes for RVSM operations may be found in General Planning chapter 4.

(c)
Reported and forecast weather conditions on the route of flight.

(d)
Minimum equipment requirements pertaining to height-keeping systems.

(6) Preflight procedures at the aircraft for each flight.

(a)
Review maintenance logs and forms to ascertain the condition of equipment required for flight in the RVSM airspace.

(b)
During the external inspection of aircraft, pay attention to the condition of static sources and the condition of the fuselage skin in the vicinity of each static source and any other component that affects altimetry system accuracy (this check may be accomplished by a qualified and authorized person other than the pilot, e.g., a flight engineer or maintenance personnel).

(c)
Before takeoff, the aircraft altimeters should be set to the local altimeter (QNH) setting and should display a known elevation, (e.g., field elevation) within the limits specified in aircraft operating manuals. The difference between the known elevation and the elevation displayed on the altimeters should not exceed 75 ft. The two primary altimeters should also agree within limits specified by the aircraft flight manual.

(d)
Before take-off, equipment required for flight in RVSM airspace shall be operational, and indications of malfunctions should be resolved.

(7)
Prior to RVSM airspace entry, the following equipment shall be operating normally:

(a)
Two primary altitude measurement systems.

(b)
One automatic altitude-control system.

(c)
One altitude-alerting device.

(d)
Should any of the required equipment fail prior to the aircraft entering RVSM airspace, the pilot should request a new clearance so as to avoid flight in this airspace.

NOTE: Operating Transponder. The operator should ascertain the requirement for an operational transponder in each RVSM area where operations are intended. The operator should also ascertain the transponder requirements for transition areas adjacent to RVSM airspace.
(8) In-flight Procedures
　
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