TM  1-1520-240-10 2-1-6            2-1-10.  Brakes and Steering Isolation Switch. The brakes and steering isolation switch is on the HYD control panel on the overhead switch panel (fig. 2-1-10 and 2-1-14). It is labeled BRK STEER, ON, and OFF. The switch isolates the brakes and steering hydraulic subsys- tems from the rest of the utility hydraulic system in the event of a leak in the subsystem. The normal position of the switch is ON. The switch is guarded to ON. Setting the switch  to  OFF,  closes  the  power  steering  and  brakes valve on the utility system pressure control module, iso- lating  the  brakes  and  steering  subsystem.  With  the switch at OFF, limited brake application are available due to an emergency brake accumulator in the brake subsys- tem. Power to operate the isolation valve is from the No. 1 DC bus through the HYDRAULICS BRAKE STEER circuit breaker on the No. 1 PDP. 2-1-11.  Instrument and Control Panels. NOTE The NVG overhead switch panels are shown. Description of control panels and operating procedures reflect NVG configuration only. Figures   2-1-5   and   2-1-6   show   center   and   canted consoles. 712 Figures 2-1-7 through 2-1-10 show the copilot instrument panel, center instrument panel, pilot instrument panel, and the NVG overhead switch panel. 714A   Figures 2-1-11 through 2-1-14 show the copilot instrument panel, center instrument panel, pilot instru- ment panel, and the NVG overhead switch panel. 2-1-12.  Personnel/Cargo Doors. Entry can be made through either the main cabin door or the cargo door and ramp. 2-1-13.  Main Cabin Door. The main cabin entrance (15, fig. FO-1) door is on the right side of the cargo compartment. The door is divided into two sections: the upper section containing a jettisonable panel and  the  lower  section  forming  the  entrance  step.  When opened, the upper section slides upward on overhead rails and the lower section swings downward. When closed, the two sections mate to form the complete door. Handles are provided on both the outside and the inside of the door for accessibility. Refer to Chapter 5 for the allowable airspeed imposed  on  the  helicopter  while  operating  with  the  cabin entrance door sections in various positions. 2-1-14.  Cargo Door and Ramp. Chapter 6 provides a detailed description and operation of the cargo door and ramp. 2-1-15.  Pilot and Copilot Sliding Windows. The upper section of each jettisonable door (39, fig. FO-1) in the cockpit contains a sliding window. The window slides fore and aft and is locked and unlocked by a handle at the forward end of the jettisonable door. The handle is moved forward to lock the window and aft to unlock the window. 2-1-16.  Seats. The pilot’s and copilot’s seats (9 and 40, fig. FO-1) are on tracks to permit forward and aft, vertical and reclining posi- tion adjustments. Bungee cords in each seat exert an up- ward force on the seat when it is down or tilted. 2-1-17.  Seat Fore-and-Aft Lever. A fore and aft control lever (14, fig. 2-1-3) for horizontal seat adjustment is on the right side of each seat support carriage. When the lever is pulled UP, the seat is unlocked and can be moved along the tracks on the cockpit floor. When the lever is released, the seat is locked in position horizontally. The total range of the horizontal movement is 4 inches in 1 inch increments. 2-1-18.  Seat Vertical Lever. Vertical seat adjustment (15, fig. 2-1-3) is controlled by a lever on the right side of each seat. When this lever is pulled UP, the seat is unlocked and can be moved vertically along a track through a range of 5 inches. The range is divided into 1/2 inch increments. When the lever is released, the seat is locked in position vertically. CAUTION With the seat in the full up rotation posi- tion (zero tilt) the seat may not be able to be  locked  in  the  full  down  vertical  posi- tion. Ensure the seat is locked when ad- justing the vertical axis, especially when the seat is in full up rotation position (zero tilt). 2-1-19.  Seat Rotation Lever. A control lever (20, fig. 2-1-3) for adjusting the seat reclining position is on the left side of each seat. When this lever is pulled UP, the seat is unlocked and can be rotated through a 15º tilt range divided into four equal increments. The seat, in effect, is pivoted up and down around a horizontal axis. When the lever is released, the seat is locked in the selected tilt position. 2-1-20.  Armored Seats. Both  the  pilot  and  the  copilot  seats  are  equipped  with  a combination of fixed and adjustable ceramic armor panels (fig. 2-1-15). Fixed panels are installed under the back and bottom seat cushions and on the outboard side of each seat. A shoulder panel (if installed) is mounted on the outboard side of each seat. The shoulder panel is hinged from the seat back so it can be moved aside for ease of exit from the helicopter. The panel is secured in its normal position by a latch and an exerciser cord.