Publication: Magyar Közlöny
Issue: MK-2009-104 (Year: 2009, Number: 104)
Era: 2004-2010
Section: 
Paragraph Index: 2563

d) either τu (4.3.4.4.1) is not increasing or, if it is, the range to the threat is less than 3.2 km (1.7 NM). The following values are used for Tir. S Tir , s Note 1.— Condition 2) of a) above allows the use of an increased rate RA against a levelling-off, unequipped threat in an altitude-crossing encounter which does not qualify for a sense reversal (4.4.4.3.1). This situation can arise because the threat is levelling off with a low deceleration such that its predicted altitude at the point of closest approach follows the ACAS II aircraft’s current altitude on each succeeding cycle. An increased rate RA could generate additional altitude separation. Note 2.— Condition c) prevents undesirable interactions between the collision avoidance logic and the ground proximity warning system (GPWS). 4.4.4.1.2 The default values for Żclm and Żdes are 7.6 m/s (1 500 ft/min) and –7.6 m/s (–1 500 ft/min), respectively. If 7.6 m/s (1 500 ft/min) exceeds the aircraft’s climb capability, a suitable value may be substituted to enable the generation of climb RAs. If the actual rate of climb or descent exceeds the default rate, the actual rate is substituted, if it is less than a maximum rate of 4 400 ft/min; otherwise the maximum rate of 4 400 ft/min is used. Note.— Climbs may be inhibited in response to discrete indications e.g. that the aircraft is at its ceiling. However, it is possible that certain aircraft will have such limited climb capability that RAs to climb at 7.6 m/s (1 500 ft/min) have to be permanently inhibited to comply with Chapter 4, 4.3.5.4. 4.4.4.1.3 RA retention. Subject to the requirement that a descend RA is neither generated nor maintained below a specified altitude (Chapter 4, 4.3.5.4.1), the RA is not modified (Chapter 4, 4.3.5.6) if any of the following apply:

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