CL650/Operations Reference/Special Approach
Important!
The Hot Start Challenger 650 is not currently fitted with Service Bulletin (SB) 650–34–008 which provides Steep Approach Capability, however the modification is related to the EGPWS/TAWS equipment and does not affect airplane performance. The simulator pilot may therefore conduct approaches that would normally require SB 650–34–008 to be implemented on the understanding that EGPWS warnings and cautions are likely.
Introduction
Approaches up to 3.5° glidepath angle are entirely conventional, there are no specific limitations and procedures to apply in order to operate precision and non-precision approaches up to 3.5°. Approaches between 3.5° and 4.49° require special performance considerations (“Supplement 11” in the official Airplane Flight Manual), and approaches between 4.5° and 5.5° are true “steep” approaches and have significant performance and operational differences (“Supplement 12” in the official Airplane Flight Manual). This Special Approach Supplement attempts to condense the relevant information into a simple and clear format for sim pilots.
This Special Approach Supplement also contains “Special Airport Briefings” for specific, potentially difficult or challenging airports. Further airport briefings may be added as operational experience emerges from the community.
Applicability
This Special Approach Supplement applies when the final glidepath angle to the runway is greater than 3.5°.
As such, this supplement would not necessarily apply where the instrument approach terminates well before the runway and the procedure requires visual maneuvering to complete the landing. These are usually shown as V-MDA approaches in the FMS, and normally will not have the runway number in the procedure name, instead having a single letter code only such as RNP-A or LOC/DME-B.
Some examples::
- 6.5° IGS approach to the runway — Exceeds aircraft limitations, not authorized
- 6.5° LOC/DME approach to a missed approach point, then maneuvering to a 3.5° visual final approach — Special Approach Supplement limitations do not apply, but could be consulted for guidance on the instrument segment
- 5.5° ILS approach to the runway — Special Approach Supplement applies
- 4.5° RNAV/RNP approach to the runway — Special Approach Supplement applies
Special Performance Approach—3.5 to 4.49°
The ability to conduct a special performance approach depends on the airport elevation and whether the aircraft is fitted with Service Bulletin 650–34–008. The combination of high elevation and greater than 3.5° approaches can infringe the normal EGPWS/TAWS limits. As such, special performance approaches can be divided into two groups: Group A does not require the Steep Approach function, whereas Group B requires the Steep Approach function switched on. In both cases the minimum autopilot disconnect height for ILS approaches is raised from the normal 80 ft to 160 ft. The special performance approach should be flown fully configured for landing and at VRef + Wind Correction prior to descending on the glide path. It is allowable to operate at idle thrust even with wing and/or cowl anti-ice selected on, provided no associated EICAS caution messages are annunciated. LPV approaches are not permitted.
Steep Approach—4.5 to 5.5°
Steep Approach operations between 4.5° and 5.5° require SB 650–34–008 to be fitted. The steep approach should be flown fully configured for landing and at VRef + Wind Correction prior to descending on the glide path. The following additional limitations apply:
| STEEP APPROACH LIMITATIONS | ||
| Maximum landing weight | 35,000 lb / 15,875 kg | |
| Maximum runway elevation | 5,000 ft | |
| Maximum crosswind component | 20 kts | |
| Maximum wind speed approach increment | 10 kts - if conditions require a greater increment a diversion must be initiated | |
| Approach with wing and/or cowl anti-ice selected ON | Not Permitted | |
| Approaches in known icing | Not Permitted | |
| Partial flap approaches | Not Permitted | |
| Deliberate one engine approaches | Not Permitted | |
| Landing on contaminated runway | Not Permitted | |
| Use of Autopilot System | Not Permitted | |
| Use of Auto Throttle System | Not Permitted | |
| Flight Director System | Permitted for ILS and APPR LNAV/VGP guidance | |
| LPV approach guidance | Not Permitted | |
| Minimum height for go-around following an engine failure | 200 ft AGL | |
Steep Approach operations are not permitted with failures of Flaps, Ground Spoilers, Anti-Skid, Nose Wheel Steering, Radio Altimeter, or Thrust Reversers.
In addition, diversion to an airport that does not require a steep approach must be performed following any situation necessitating an approach speed greater than VRef, a landing with flaps other than 45°, or a landing with unsafe gear.
Performance values from the FMS performance system are not to be used in steep approach operations; landing performance calculations must be performed with reference to the following table:
Special Airport Briefing—KASE, Aspen, Colorado, USA
See Special Airport Briefing—KASE