Cessna 402b Flight Manual
I used to plan on 180KTAS in a C402B. Maybe 170 is good for a ship that's been around a while and finished up a little bent and with old donks and a bit of weight. As for IAS on descent, I can't remember Vmo but I think it was around 199KIAS??? Best check your manual. Anyway, I was taught to set a power as per a schedule of reduction of ONE inch of manifold pressure every TWO minutes during the descent with the aim of arriving in the circuit area at about 20 inches (I think it was 20, we're going back a way) or whatever your downwind power setting is. The point is, you take what ever airspeed you get. It won't vary too much from the cruise IAS when the power starts coming back.
I don't know of anyone who operates that class of aircraft and attempts to achieve a certain IAS performance on descent. This technique will facilitate (as compressor stall has already mentioned) a 500ft/min ROD without undue risk of an overspeed due to turbulence or thermals.
Cessna 402b For Sale
Derived from the Model 411, the Cessna 401 and 402 are essentially the same aircraft put to two different uses. The 401, introduced in 1966 and discontinued in 1972, was basically designed as a medium to light executive transport. 2003 polaris xc 700.
Is that what you were getting? As I recall the idea is the engine is now operating below the threshold of the turbo-super-charging and larger throttle movements are not an issue. In the upper ranges gradual cooling is preferred to stop the turbos accumulating (someone help me out here.) deposits of baked-on oil?? Carbon or something??
Cessna 402b Flight Manual
Anyway that's the general idea. As always don't take pprune postings as gospel. Check your handling notes, manual and Chief Pilot. VH-ATY mmmmmmmmm Yes HA you sent me on some incredible missions in that one. Super Puma Gearbox (450kg) to Troughton Island after a Cyclone had swished passed Darwin. Then ofcourse the infamous evening when you rung me at 2:30am to fly a C210 to Alice full of Papers when it was raining cats and dogs. Went down to the office met Tim whos bus had just had a engine fire 15 minutes out in the soup, and had been radar vectored back, e Keys of RWY29 with partial power.
Should have seen the damage on the C210 after. Lucky man Tim very lucky. I did the plan because the DME was inop in the C210 couldnt do the leg between Katherine and tennant greater than 2 hrs with out a fix. So went to go the Baron but no good cause the amount of fuel required. So then I went ATY, man did I get some night time that night and the following return because duty limits. ATY the beast that had a mind of its own or engine I mean.
It would have a hiccup everyso often in the fuel flow on one side Just when didnt expect it like about to eat a sandwich or something, darn thing. Filled a whole MR with that particular fault. ' Oh we fixed it ' Yeah sure mate:E Anyway I hope its ok these days heard it got a total make over.