Topics in Category: King Air - Rotate.Aero Wed, 16 Oct 2019 01:46:52 +0000 MYOB /media/kunena/images/icons/rss.png Topics in Category: King Air - Rotate.Aero en-gb ATA 35-20, Cabin Altitude Switch - by: Mark
The switch is located in the forward cabin, right side-wall, just forward of the emergency exit.

When excessive cabin altitude is sensed, the switch closes and provides 28VDC to the control solenoid (horizontal silver barrel) of the cabin oxygen valve. A crew activated manual cable can be seen attached to the aft side of the valve.

Several methods of testing are mentioned in the Maintenance Manual. One of which is testing the switch while still connected to the aircraft, which seemed difficult to almost impossible. Another method allowed for the switch to be removed and tested separately.

A test chamber is required. The switch is attached to some internal wires and placed inside the chamber which is then sealed. A vacuum can be applied via a feed-though AN fitting. With the proper altitude simulated, the switch will close. Continuity can be read with a meter attached to the chamber's test wires.

Actual mask deployment can be verified by jumping the aircraft side switch wiring. The valve solenoid can be clearly heard activating. (I found a broken suppression diode on this particular aircraft.

King Air 200
AMM 35-20-01
WDM 35-20-01-01
ATA 35 Oxygen Wed, 20 Jun 2018 01:07:40 +0000
Floor Panel Locks - by: Mark
By sufficiently turning the fastener counter-clockwise, the tab will swing in "under" the floor support structure and it can be pulled tight in the clockwise direction. Each fastener should have a gap around a 1/4" before the panel is placed back in position for re-install.

ATA 25 Equipment/Furnishings Wed, 20 Jun 2018 00:16:53 +0000
ATA 34-10, Pitot Probe R/R - by: Mark

The probe assembly can be split open in the middle which allows access to the electrical connector. The probe side read open with ohm-meter.

The pneumatic connection is accessed by pulling the mount plate off the aircraft.

New probe coil resistance.

The bleed hole (which must be covered for a leak check) was located quite near the tip of the probe itself.

Good leak check...... good heat...... good to go!!]]>
ATA 34 Navigation Sun, 19 Mar 2017 00:10:08 +0000