Apollo 15 Hadley Plain
The Apollo 15 flight was the fourth landing on the moon and the first to use the lunar rover (LRV).
There are two EL3D scenarios for this landing:
This is a short flight in program P66. It starts at about 500’. The LM is descending at about 17fps and moving forward at about 70fps. The AGC program is P66. The Primary Navigation Guidance System (PGNS) switch is set to Attitude Hold. This is allows manual control of the LM attitude. The throttle is set to Automatic and the computer handles all of the throttle functions. The astronaut may click the Rate of Descent (ROD) switch up or down to initiate 1fps per click commanded changes in descent rate. Pressing F3 will show the historic landing site. A large arrow sets over the top and a green outline of a LM is on the surface.
The longer flight begins farther up
range and at about 8000’. The LM is
moving at about 500fps and descending at 140fps. The AGC program is P64. The Primary
Navigation Guidance System (PGNS) switch is set to Auto. That means the autopilot is engaged. The DSKY display is flashing indicating it is
expecting a PRO command. Pressing PRO (keyboard
‘*’) stops the flashing and allows for manual redesignation
of the landing site. The angle to the
computed landing site is displayed in the right two digits of Register 1 on the
DSKY. Aligning this number with the
Landing Point Designator (LPD) on the window will show the intended landing
point. If this is not acceptable one can
nudge the controller in the desired direction and the computer will recalculate
the landing site, issue commands to the autopilot and display the new angle on
the DSKY. As the LM slow pitches forward
the LPD angle will change a little bit. Also,
very near the landing site the LPD angle will be so far below the window that
the LPD angle will go off scale. The two
digits to the left on Register 1 of the DSKY indicate the time left for LPD redesignation.