OM3037 Operation - Section 3 Operating Instructions Page 3-33 Not currently used. Reserved for future use or options. A4. NOT USED B4. Manual Backup Lights This amber indicator will illuminate when the manually operated Manual Backup switch (3, Fig- ure 3-6, Instrument Panel) is turned “on”. C4. 5-Minute Idle Engine Shutdown Timer When the Engine Shutdown Timer switch has been activated (2, Figure 3-6, Instrument Panel), this indicator light will illuminate to indicate that the shutdown timing sequence has started. Re- fer to Instrument panel for operation of this switch. D4.
Retard Speed Control Indicator This amber light is illuminated when the RSC switch mounted on the console is pulled out to the “On” position. E4. Check Engine This amber “Check Engine” indicator will illuminate if a malfunction is detected by the electronic engine control system. If this indicator illuminates, notify maintenance personnel as soon as possible. A5. NOT USED Not currently used. Reserved for future use or options.