(b)
Emphasis should be placed on promptly setting the sub-scale on all primary and standby altimeters to 29.92 in. Hg/1013.2 (hPa) when passing the transition altitude and rechecking for proper altimeter setting when reaching the initial cleared flight level (CFL).
(c)
In level cruise it is essential that the aircraft is flown at the CFL. This requires that particular care is taken to ensure that ATC clearances are fully understood and followed. Except in contingency or emergency situations, the aircraft should not intentionally depart from CFL without a positive clearance from ATC.
(d)
During cleared transition between levels, the aircraft should not be allowed to overshoot or undershoot the cleared flight level by more than 150 ft (45m). When changing flight levels within RVSM airspace, vertical speeds should be limited to 1000 fpm or less. This can reduce the likelihood of TCAS Resolution Advisories (RAs) occurring and should help to ensure the aircraft does not undershoot or overshoot the CFL by more than 150 ft.
NOTE: It is recommended that the level off be accomplished using the altitude capture feature of the automatic altitude control system, if installed.
(e)
An automatic altitude-control system shall be operative and engaged during level cruise, except when circumstances such as the need to retrim the aircraft or turbulence require disengagement. In any event, adherence to cruise altitude should be done by reference to one of the two primary altimeters.
(f) The altitude-alerting system shall be operational.
(g)
At intervals of approximately one hour, cross-checks between the primary altimeters and the stand-by altimeter should be made. A minimum of two primary altimeters should agree within 200 ft (60m) or a lesser value if specified in the aircraft operating manual. (Failure to meet this condition will require that the altimetry system be reported as defective and notified to ATC). The difference between the primary and standby altimeters should be noted for uses in contingency situations.
1 The normal pilot scan of cockpit instruments should suffice for altimeter crosschecking on most flights.
2 At least the initial altimeter cross-check should be recorded. On Class II navigation legs this should be in the vicinity of the point where Class II navigation is begun (e.g., on coast out). The readings of the primary and standby altimeters should be recorded and available for use in contingency situations. (Class II navigation is defined in FAA Order 8400.10).
NOTE: Future systems may make use of altimeter comparators in lieu of cross-checks by crew.
(h)
Normally, the altimetry system being used to control the aircraft should be selected to provide the input to the altitude-reporting transponder transmitting information to ATC.
(i)
If the pilot is notified by ATC of an Assigned Altitude Deviation (AAD) error which exceeds 300 ft (90m) then the pilot should take action to return to CFL as quickly as possible.
(9)
Post Flight. In making maintenance log book entries against malfunctions in height-keeping systems, the following information should be noted when appropriate.
(a)
Primary and standby altimeter readings.
(b)
Altitude selector setting.
(c)
Subscale setting on altimeter.
(d)
Autopilot used to control the airplane and any differences when the alternate system was selected.
(e)
Differences in altimeter readings if alternate static ports selected.
(f)
Use of air data computer selector for fault diagnosis procedure.
(g)
Transponder selected to provide altitude information to ATC and any difference if alternate transponder or altitude source is manually selected.
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