Figure 6-7.  When possible, have a passenger reconfirm that critical tasks are completed. Figure 6-8.  The pilot must continually juggle various facets of  flight, which can become overwhelming. The ability to prioritize,  manage inflight challenges, and digest information makes the pilot  a better professional. checklist and hold the gear handle down until there are three  green lights. This tactile process of verbally communicating  coupled with a physical action are most beneficial.  It is necessary for a pilot to have a thorough understanding  of all the equipment and systems in the aircraft being flown.  Lack of knowledge, such as knowing if the oil pressure gauge  is direct reading or uses a sensor, is the difference between  making a wise decision or poor one that leads to a tragic error.  Checklists are essential flight deck internal resources. They  are used to verify that aircraft instruments and systems  are checked, set, and operating properly. They also ensure  the proper procedures are performed if there is a system  malfunction or inflight emergency. Students reluctant to  use checklists can be reminded that pilots at all levels of  experience refer to checklists, and that the more advanced the  aircraft is, the more crucial checklists become. In addition, the  pilot’s operating handbook (POH) is required to be carried on  board the aircraft and is essential for accurate flight planning  and resolving inflight equipment malfunctions. However, the  ability to manage workload is the most valuable resource a  pilot has.  [Figure 6-8] Air traffic controllers and AFSS are the best external  resources during flight. In order to promote the safe, orderly  flow of air traffic around airports and along flight routes,  the ATC provides pilots with traffic advisories, radar  vectors, and assistance in emergency situations. Although  6-7 External Resources