Gents

How did the original flight crew lined up for an ILS approach ?
When I am somewhere in front (30 drgs) from the ILS path and turn the AP from heading to auto or manual GS the both VR and GS are amber. In this case the 707 is making a turn and gets from the glide path. I turn back on the heading AP but I guess this is not the way it should. :-[

How did the orig. flightcrew flew such an approach when the field was covered by clouds and the handy electronic card (GPS) was not at hand.    ;)  

Thanks for help

Jan Koppen

Jan,

Here is some information that I wrote for the 727, but it will also work for the 707.

The key to a autopilot approach is not to hurry the poor autopilot. Remember this is 1950's state-of-the-art stuff so you can't expect 757, 767, or Airbus navigation or electronics. In the real plane you need to be set-up for the approach long before intercept...no different here!

Get all the radios set to the correct frequencies and set the course on the HDI to the ILS inbound course. You can get the correct freq. from the MAP drop-down. Just mouse over the ILS for the runway you plan to land on and the ILS information will appear.

As you fly in the traffic pattern have the autopilot in MANUAL or HEADING SELECT with ALTITUDE HOLD engaged. You can steer the plane in heading select and work yourself toward and intercept heading.


As you get close to the ILS intercept be at FLAPS 25 and around 160 KTS. This will give you a better degrees per second turn rate thus giving the old autopilot a better chance of success. (the faster you go the slower the turn rate for a given bank angle)

You can select AUTO-G/S anytime during your vectoring for the intercept. The autopilot will remain in HEADING SELECT until LOC intercept.
You must remain BELOW the G/S and intercept the LOC first.

I set up the plane on an intercept heading of around 30 degrees to the localizer and on the initial approach altitude for the ILS selected and about 10 miles from the airport.

I set up the autopilot & F/D in altitude hold and heading select.

I select G/S AUTO on both the autopilot and the F/D. I am flying at 150 KTS with flaps 25 which is a normal setting for this phase of the approach.

Give the autopilot a chance to do it's thing by not rushing the approach.

As the LOC comes alive, the autopilot and F/D will captured the LOC and intercept. The heading select will trip off. With the LOC captured and the plane at 160 KTS and flaps 25 degrees I am now trucking towards the runway. As the G/S comes alive select gear down. One dot to G/S intercept select flaps 50 degrees and as the plane pitches down at G/S intercept adjust power to maintain speed. For these approaches I set the fuel load to 20,000 # and I used around 130 KTS on final.

Take note of the approach progress display group of lights on the instrument panel. They show the modes of the autopilot and the F/D as they go through the various arm & capture modes.

Make smooth and slow power changes and try to hold a constant speed. Every speed change will result in a pitch change and thus a trim change and the approach becomes unstable. I use FUEL FLOW to set power. At 50 degrees flap at this weight around 2,500 to 3,000 FF should be close. Adjust smoothly to stay on speed.

The 707 is not an auto land plane so you must disconnect before touchdown.

Remember this is a "game" not a multi-million dollar simulator. I think it's a great simulation and it flys pretty much like the real thing which was not CAT-III. Give it a try and don't rush the approach and it will do a good job.

Lou

Lou

Thank you Lou

Jan Koppen
Amsterdam