G200 Flight crew report crossing the ORD 345 Radial during the Pal-Waukee 2 departure from PWK. Crew did not note or comprehend the suggested speed chart to maintain the required turn radius.
Synopsis
G200 Flight crew report crossing the ORD 345 Radial during the Pal-Waukee 2 departure from PWK. Crew did not note or comprehend the suggested speed chart to maintain the required turn radius.
Narrative
We got the PWK2 departure and were assigned a right turn to heading 030; 1 mile after departure. The First Officer was the Flying Pilot from the left seat; I was Pilot In Command in the right seat. This was a Part 91 leg without passengers. We briefed the departure; for a tight right turn. I had in the back of my head that we have to keep the speed low; to make this turn tight. The departure had no speed restrictions; nor did ATC assign a speed restriction. With the departure demanded to stay east of O'Hare radial 345; I figured that 210 KTS would be a good speed for the turn. Our clean wing speed was 205 KTS. After take off the First Officer called for autopilot and auto throttles to be engaged; he called for clean wing; and asked me to FLC [Flight level Change] him to 250 KTS. This would be normal procedure and he knows that this aircraft is very unsafe at slow speeds; in turns; with a clean wing. I retracted the slats; since this is the procedure at clean wing speed; so that the slats don't get damaged. I advised against 250 KTS; pointing out; that this will increase the turn radius; at which point he twisted the speed bug up to 250 KTS himself. ATC was advising that our turn got too wide. At this point I partially took control and bugged 180 KTS. Without slats and in the turn we were close to a stall; so I increased the speed to 210 KTS. The First Officer wanted to increase the bank angle to 45; which I did not allow due to the slow speed and clean wing; and being so close to stall. Apparently; at this point we had gone beyond the 345 radial for a brief time; and got the notification from ATC to call a phone number; when on the ground.I would suggest; to develop a new SID; one that includes a speed restriction. This will help pilots to determine configuration for the aircraft.
Second reporter narrative
Cleared to destination via the PAL-WALKEE TWO Departure expect radar vectors to BADGER then as filed. I was sitting in the left seat and acting as the pilot flying. The Captain was sitting in the right seat and acting as the pilot not flying. On the chart for this particular SID there is no mention of a speed restriction nor did ATC advise of a speed restriction. At 400 FT AGL I called for a right turn to assigned heading 030. When speed was appropriate I called for flaps 0 and also called for autopilot and autothrottles to be engaged. Shortly after this we were handed off to the first Departure Controller. At this point we were accelerating through Vt (clean wing speed) which was around 205 KIAS and I called for clean wing and continued to accelerate to 250 KIAS which is the normal procedure. The Controller advised us that our turn was too wide; we had violated a 180 KTS speed restriction; and had come into conflict with the arrivals into ORD. Note: there is an advisement on the chart that says at 180 KIAS you need to maintain a 30 degree bank; but it is not listed as a 'restriction'In the future we now know to execute such procedures at a slower speed and leave the flaps down. Upon completion of the first turn and level off we can then proceed to accelerate and clean up the aircraft.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.