B737 Undifferentiated or Other Model
Flight Crew Type 1850
Situational Awareness; Confusion
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Manuals
This event occurred while taxiing out for takeoff. It was near midnight and near the end of our duty day. When running the Final Items on the Before Takeoff checklist; the Captain stated he could not find the Take-off Warn Test Switch. We held the taxi; increased the cockpit illumination and we still couldn't find the switch. At that point; I searched the Flight Manual (FM) for the switch and the configuration check procedure. I was taken aback when I didn't see any language that would say something along the lines of; '...for tail #(s); the Take-Off Warn Test Switch is located...' I was in a bit of disbelieve that the aircraft may not actually have the switch. I couldn't recollect any operations notes that may have addressed the issue of aircraft not equipped with the switch. That said; I pulled out my flashlight and carefully scanned the entire control panel for the switch. Once we concluded that indeed there was no switch; I looked in the FM for the configuration settings covered in the Take-Off Warn system. I found the list on FM 3.90.9 which we used to manually check that the Speed Brake; Trim; Flaps/Leading Edge devices were in the takeoff positions along with ensuring the parking brake was off. After this manual check; both the captain and I felt we had complied with the intent/function of the switch and felt that we were completely safe for takeoff. Now; at least speaking for myself; in the back of my mind I was thinking that this had to be a known issue that was being addressed in the background or that somehow; the switch was there somewhere and we were missing it. I'm sure that some fatigue contributed to that thought and to the lack of follow up other than this [Report].
[Report narrative contained no additional information.]
Boeing 737 flight crew reported being unable to locate the takeoff warning test switch.