Section II. FD/LS OPERATING MODES

TM 1–1520–238–T–1 1–4 Change 5 1–5 FD/LS OPERATION – GENERAL 1–5 Section II. FD/LS OPERATING MODES 1–5 FD/LS OPERATION – GENERAL. a. Continuous Test Mode. (1) FD/LS continuous test mode is an automatic test that is performed continuously following power-up. (2) During the continuous test mode each system test is performed one after the other until the operator selects FD/LS with the DATA ENTRY switch on the DEK (ADC) or the FD/LS fixed action button (FAB) on the CDU (ADD). A list of continuous test mode NO–GO indications is available for operator viewing. (3) The mode is used to determine current status of flight critical and mission essential systems. All continuous test mode results are stored in an auto status buffer located within FCC memory. (4) The FD/LS prompt software routine is bypassed until 2 minutes have lapsed from initial aircraft power-up. This allows for all system hardware components to stabilize and omits erroneous system NO-GOs due to power surges upon initialization. NOTE FD/LS NO-GO messages may take as long as 12 seconds after an associated system indicator lights on pilot or CPG caution/warning panel. (5) A detected NO-GO causes a flashing FD/LS prompt to be displayed on the HOD, a FDLS message on the CDU (ADD) and the associated system indicator on the pilot and CPG caution/warning panels to light. (6) The FD/LS prompt flashes at a rate of one flash per second for 8 seconds and does not repeat again until 56 seconds have elapsed. (7) Once FD/LS is selected with the DATA ENTRY switch on the DEK (ADC) or the FD/LS FAB on the CDU (ADD), [an asterisk is displayed to the left of the FD/LS message which activated the FD/LS flasher (ACZ)] the FD/LS prompt is reset so that it does not appear again until a new NO-GO is detected.