cv880sw autopilot

[bobf]

Hi. I am new here. I need a set of operating instructions for the cv880sw gauge autopilot for use in the Convair 880. Can anyone please help me? Thanks and best regards to all,Bob.

[eastern1004]

Hi Bob, welcome ;D

Go here - tonymadgehjg.proboards.com/index.cgi?board=hjgaircraftlistings&action=display&thread=1699

Scroll down to autopilot notes

[bobf]

Hi. OK. I found it. Thanks. By the way is there a way on this Forum to get e-mail notification when an answer is posted? Regards, Bob.

P.S. What is the G/P EXT and EXT NAV on the autopilot? I can't find it in the explanation. Also I see a small IHOP. What is this?

[eastern1004]

Below the selector on the left you read

Pitch Selector

That is all that knob will do, adjust pitch for IAS hold, climb or descent holds.

G/P Ext means Glide Path hold by external source (ILS/Glide Slope), I think

EXT NAV probably allows aircraft to lock onto an VOR radial

I never use that selector. I use the climb / descend thumb wheel, and the selector on the right

[aerofoto - HJG Admin]

is there a way on this Forum to get e-mail notification when an answer is posted?

"NO" .... unlike is the case with some other forums .... we expect people to monitor their own postings once posted.

Mark C
BOG/COL

[aerofoto - HJG Admin]

AUTOPILOT NOTES

is there a way on this Forum to get e-mail notification when an answer is posted?

"NO" .... unlike is the case with some other forums .... we expect people to monitor their own postings once posted.

What is the G/P EXT and EXT NAV on the autopilot? I can't find it in the explanation. Also I see a small IHOP. What is this?

I´ve never provided any explanation of these particular other AP modes simply because when these panels were first engineered .... some 8 years ago (though George has done a very nice job of further updating these for us much more recently than this) .... no explanation of these modes was ever provided at the time of their original release.

In my 8 years of flying all version of these panels I´ve never once ever used these other modes .... even on relatively long flights. Instead I´ve resortd to standard AP modes .... as well as standard navigation modes aided by the AP.

You´re certainly not missing anything by not using them .... I can assure you !

As far as AP funtionality is concerned .... the CV880 and CV990 AP´s are in operated precisely the same manner as those which accompany the HJG DC8 panels .... and similar also in respect of the HJG/HILMERBY/CARTY DC9 panels too though there are some different features associated with this particular AP version and programming.

For quick reference .... and despite the link being provided (above) which someone else has already provided for my "CONVAIR PANELS INSTALLATION & HANDLING NOTES" online/forum manual for these aircraft (both the CV880 and CV990 are included in this) .... here´s an extract from these service notes covering/explaining AP use ....

The AP on all HJG CONVAIR panels functions as follows ....

The AP is activated by selecting the SERVO SWITCH to "AUTO PILOT" position.

When the AP is engaged it will also hold the aircraft at whatever ROC/ROD was established at the time of its first being engaged.

During AP controlled flight the aircrafts ROC/ROD can be adjusted using the "VERT SPEED" thumb wheel. Careful mousing at the bottom of this wheel ("CLIMB" position) will set and control ROC .... and similar mousing at the top of this wheel ("DESCEND" position) will set and control ROD .... both in proportion to mouse input. Work on the theory that each mouse click of the VERT SPEED thumb wheel roughly corresponds to a command of approximately 100 FPM ROC/ROD.

To engage and hold a specific altitude the aircrafts ROC/ROD should first be set to no more than 500 FPM .... and less during the last few hundred of climb/descent toward any target altitude. As the altimeter needle/s indicate precisely the desired altitude simply mouse click the center of the VERT SPEED" thumb wheel. The aircraft should then begin to maintain altitude. The aircraft will at first drift slightly above and below the selected altitude .... this is quite normal. The aircraft will eventually settle into a perfect altitude capture after a few moments. Care should be taken to engage AP ALT/HLD mode at the precise increment of any desired altitude .... paying close attention to both the altimeter needles and the ROC/ROD gauge is essential.

To commence further climb/descent simply mouse either the bottom or top of this thumb wheel accordingly. This action disengages the ALT HLD function without disengaging the AP .... then select whatever ROC/ROD is desired by mousing either the bottom or top of the VERT SPEED thumb wheel accordingly .... as described above.

The VERT SPEED" thumb wheel will not .... intentionally .... function in manual flight mode. In this mode trim must be set manually in order to set any desired ROC/ROD. The Trim warning horn will be triggered in response to each manual input. This warning horn will not be triggered when Trim is adjusted during AP controlled flight mode.

There is an "IAS HOLD" selector on the AP mode rotary switch located the far left of the AP. This should not be engaged below 300kts. It is important to note that when engaged IAS HOLD will adjust the aircrafts pitch attitude to whatever it determines necessary in order to maintain a specific speed. Typically .... if more power is then applied the AP will increase the aircrafts pitch attitude in order to maintain speed .... and if power is then retarded the AP will decrease the aircrafts pitch attitude accordingly in order to maintain speed .... automatically adjusting the aircrafts ROC/ROD in the process.

IAS HOLD and "ALT HOLD" cannot be engaged together. One or the other mode only must be used.

IAS HOLD is not an AT .... and should not be used as such. CV880 & CV990 aircraft were not equipped with AT systems.

A large "TURN" knob is located in the center of the AP. This can be used to turn the aircraft left or right during AP controlled flight .... but only when the AP mode rotary switch is set to "TURN KNOB". It has been observed that this turn knob may not fly the aircraft through perfectly smooth turns. This is a known FS bug associated some panels. Alternatively "HDG SEL" may be used to ensure perfectly smooth turns during AP controlled flight.

If the AP mode selector switch is set to "HDG SEL" then turns may be controlled by moviong the "HEADING BUG" located on the HSI instrument on the main panel. Manually controlled turns are still possible per joystick/yoke input even during AP controlled flight, but, only when the AP rotary switch is set to TURN KNOB".

If the AP mode selector switch is set to "VOR LOC" then this will allow the aircraft to engage and track along any particular radial eminating from a pre-tuned VOR signal. VOR radials should be intercepted at less than a 20 degrees to the intended beam/course. Engaging the AP VOR/LOC at too acute an angle of intercept will cause the aircraft to weave as it endeavours to capture a VOR beam. It is always best to use HDG SEL to first allign the aircraft with any VOR signal. Once established on/or near the set beam/course then select VOR/LOC to acquire it. The aircraft may still weave slighty at first. This is a normal FS response. The aircraft will settle down to smooth tracking after a few moments.

The AP mode selector switch also features an "ILS" mode to allow coupled AP cntrolled ILS intercepts during approaches to landing. All landings should be accomplished masnually.

A cautionary red lamp (located on the top left of the main panel .... below the windshield) will be seen to flash repeatedly whenever the AP is disconnected. To cancel this lamp simply mouse click on the actual lamp to extinguish it.

Mark C
BOG/COL

[bobf]

Jun 3, 2011 12:14:13 GMT eastern1004 said:

Below the selector on the left you read

Pitch Selector

That is all that knob will do, adjust pitch for IAS hold, climb or descent holds.

G/P Ext means Glide Path hold by external source (ILS/Glide Slope), I think

EXT NAV probably allows aircraft to lock onto an VOR radial

I never use that selector. I use the climb / descend thumb wheel, and the selector on the right

Hi. Thanks for the info. Regards, Bob.

[bobf]

Hi Mark. Thanks for all the info. I appreciate it. Regards, Bob.

[aerofoto - HJG Admin]

No problem Bob .... our pleasure !

Mark C
BOG/COL