@alouette&mars
Only the last BO105 version the CB/CBS 5 is approved to use "special operations". The FM describes only under section 11 supplement 11-4 "Special takeoff and landing operations" some procedures.
That's the "Super Five" BO 105 version (CB/CBS5) with the new designed rotorblades and the newer main gearbox.
"Although the BO-105 helicopter is certified basically for operation according to FAR 27 this supplement provides standardized takeoff and landing procedures and performance data which are certified according to JAR PART 29, Second Draft, Category A operations.
This supplement only applies to helicopters having main transmission ZF FS72E (Retrofit kit, P/N 105-80037) installed.
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C.2.1 CERTIFICATION CRITERIA
The emergency and normal procedures apply to:
– restricted helipads having dimensions of at least 15 x 15 meters under day and night
conditions, and
– elevated helipads having dimensions of at least 20 x 20 meters under day conditions
only.
NOTE Operation on elevated helipads smaller than 20 x 20 m but not less than 15 x
15 m, need individual approval by the respective authorities.
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MASS LIMITS (example)
For maximum takeoff and landing gross mass refer to Fig. C1.
EXAMPLE: (see Fig. C1)
Determine: Max takeoff and landing gross mass, wind calm
Known: OAT 15 °C
Pressure altitude SL
Wind Calm
Solution: 1. Enter chart at known OAT (15 °C).
2. Move vertically up to known pressure altitude (SL).
3. Move horizontally right and read gross mass = 2262 kg."
It means, that under general HEMS conditions (3-4 persons+mission equipment) as example, the fuel load must be reduced to approx. 50-60 min flight time incl. all kinds of safety fuel! Mission time could be not more than round about 30min.
AND:
The ENGINE AND TRANSMISSION POWER LIMITATIONS limited the OEI TOT of the remaining engine to 810°C. Any BO-105 pilot knows the "normal" high TOT's. I say, under OAT's greater than 15°C thats the really limiting factor.
Last edited by tecpilot; 14th August 2004 at 06:25.