Appendix D D-2 frequency should decrease with increasing error magnitude at a rate that is at least exponential.
D.1.4 ICAO Doc. 9574 recognized specialist study groups would develop the detailed specifications to ensure the TVE objectives can be met over the full operational envelope in Reduced Vertical Separation Minimum (RVSM) airspace for each aircraft group. In determining the breakdown of tolerances between the elements of the system, it was considered necessary to set system tolerances at levels recognizing the overall objectives must be met operationally by aircraft and equipment subject to normal production variability, including the airframe SSE, and normal in-service degradation. It was also recognized that it would be necessary to develop specifications and procedures covering the means for ensuring in-service degradation is controlled at an acceptable level.
D.1.5 Based on studies reported in ICAO Doc. 9536, Review of the General Concept of Separation Panel (RGCSP), Volume 2, ICAO Doc. 9574 recommended the required margin between operational performance and design capability should be achieved by ensuring the performance requirements are developed to fulfill the following requirements, where the narrower tolerance in paragraph D.1.5.2 is specifically intended to allow for some degradation with increasing age:
D.1.5.1 The mean uncorrected residual position error static source error (SSE) of the group will not exceed ±80 ft (±25 m);
D.1.5.2 The sum of the absolute value of the ASEmean for the group and ASE3 SD within the group will not exceed 200 ft (60 m);
D.1.5.3 Each individual aircraft in the group will be built to have ASE contained within ±200 ft (±60 m); and D.1.5.4 An automatic altitude control system will be required and will be capable of controlling altitude within a tolerance band of ±50 ft (±15 m) about commanded altitude when operated in the altitude hold mode in straight and level flight under nonturbulent, nongust conditions.
D.1.6 These standards provide the basis for the separate performance aspects of airframe, altimetry, altimetry equipment, and automatic altitude control system. It is important to recognize the limits are based on studies (ICAO Doc. 9536, Volume 2) which showed ASE tends to follow a normal distribution about a characteristic mean value for the aircraft group. Therefore, the document should provide controls precluding the possibility individual aircraft approvals could create clusters operating with a mean significantly beyond 80 ft (25 m) in magnitude, such as could arise where elements of the altimetry system generate bias errors additional to the mean corrected SSE.
Appendix E APPENDIX E. RVSM AUTHORIZATION OVERVIEW £.1 RVSM Authorization Process Overview.
RVSM Authorization Flow Chart Determine which CHDO/IFO to application submit Amendment to an existing RVSM-Elements changing. authorization? No other New authorization based on one or more existing RVSM- Element? New authorization not based on any existing RVSM- Element?
para. 4.1 Determine if Yes reduest is tor amendment or new authorization para. 4.2 RVSM Authorization RVSM Authorization RVSM Authorization Group I Group II Group III para. 4.2.1 para. 4.2.2 para. 4.3.3 State which administrative change is occuring
e.g. Identify appropriate Identify appropriate
- Change of Primary Business Address Operator
- Change in Responsible Person/POC para. 3.4
- N-number change (existing acft.
- Remove airoraft from authorization statement no RVSM Make positive Elements are Provide complete documentation tor any RvSM-elements not dacumentation of Provide complete changing para. 3.2 - - RVSM-Compliant Aircraft; or previously accepted by FAA: Airoraft(s) para. 3.2 RVSM-Compliant
- RVSM-Knowledgeable Pilots Request issuance of Make positive Provide complete an amended RVSM statement for any RVSM-Elements documentation for previously accepted RVSM-Knowledgeable by the FAA para. 3.2 Pilots para. 3.:
Provide further information if Request issuance of a Request issuance of a requested new RVSM auinoraeton authorization Sign authorization upon receipt Provide further Provide further information if information if requested requested Sign authorization Sign authorization upon receipt E-1
Advisory Circular Feedback If you find an error in this AC, have recommendations for improving it, or have suggestions for new items/subjects to be added, you may let us know by emailing this form to RVSM@faa.gov.
Subject: AC 91-85A, Authorization of Aircraft and Operators for Flight in Reduced Vertical Separation Minimum (RVSM) Airspace Date: _____________________ Please check all appropriate line items:
☐ An error (procedural or typographical) has been noted in paragraph ____________ on page _______.
☐ Recommend paragraph _____________ on page __________ be changed as follows:
______________________________________________________________________ ______________________________________________________________________ ☐ In a future change to this AC, please cover the following subject:
(Briefly describe what you want added.)
______________________________________________________________________ ______________________________________________________________________ ☐ Other comments:
______________________________________________________________________ ______________________________________________________________________ ☐ I would like to discuss the above. Please contact me.
Submitted by: Date: ______________________