YYZatcboy
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B732 Autopilot Question

Thu Feb 15, 2007 2:51 am

Hey guys,

I was wondering if anyone knows if the 732 ADV used AHRS or a Vaccum/Electric Gyro for the Autopilot Altitude and Heading. If they used gyros, does anyone know the radius of Gyration?

Cheers
joe
DHC1/3/4 MD11/88 L1011 A319/20/21/30 B727 735/6/7/8/9 762/3 E175/90 CRJ/700/705 CC150. J/S DH8D 736/7/8
 
Tristarsteve
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RE: B732 Autopilot Question

Thu Feb 15, 2007 4:09 am

All B737-200 had real gyros.
Originally NO Fms and the Gyros only gave you attitude and heading. You did the rest yourself.
The AHRS was not on civil aircraft in the 1970s, all IRS IRU etc had big spinning gyros.
 
YYZatcboy
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RE: B732 Autopilot Question

Thu Feb 15, 2007 4:19 am

Vaccum or Electric? :filler:
DHC1/3/4 MD11/88 L1011 A319/20/21/30 B727 735/6/7/8/9 762/3 E175/90 CRJ/700/705 CC150. J/S DH8D 736/7/8
 
amtrosie
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RE: B732 Autopilot Question

Thu Feb 15, 2007 4:22 am

The VG's used for the autopilot are all electric Gyros. At least this is the case with e SP-77's
 
YYZatcboy
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RE: B732 Autopilot Question

Thu Feb 15, 2007 4:31 am

Ok. Anyone know the Radius of Gyration offhand?
DHC1/3/4 MD11/88 L1011 A319/20/21/30 B727 735/6/7/8/9 762/3 E175/90 CRJ/700/705 CC150. J/S DH8D 736/7/8
 
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HAWK21M
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RE: B732 Autopilot Question

Thu Feb 15, 2007 11:19 pm

http://www.b737.org.uk/glareshield.htm
The Sperry SP77 used Electric Gyros.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
YYZatcboy
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RE: B732 Autopilot Question

Fri Feb 16, 2007 12:15 am

Cheers!
FILLER FILLER FILLER FILLER
DHC1/3/4 MD11/88 L1011 A319/20/21/30 B727 735/6/7/8/9 762/3 E175/90 CRJ/700/705 CC150. J/S DH8D 736/7/8
 
avioniker
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RE: B732 Autopilot Question

Tue Feb 20, 2007 5:05 am

If you honestly can't live without knowing the value of "k" I suggest you go to the Honeywell website and see if there's anyone there with a clue. (They bought Sperry before being bought by Allied Signal)
In my many too many years of autopilot work I can honestly say I never was concerned with the Radius of Gyration. It's all about output/displacement and sensitivity of the mass.
That's why jetliners use electric gyros and not vacuum. Stability is essential.
 Smile
One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
 
atlamt
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RE: B732 Autopilot Question

Tue Feb 20, 2007 6:54 am

Quoting Avioniker (Reply 7):
That's why jetliners use electric gyros and not vacuum. Stability is essential.

Let's no forget about the latest and greatest.... Laser gyro's.
Fwd to MCO and Placard
 
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HAWK21M
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RE: B732 Autopilot Question

Tue Feb 20, 2007 5:16 pm

Quoting Atlamt (Reply 8):
Let's no forget about the latest and greatest.... Laser gyro's

Lazer Gyros have a longer life & are more Reliable.Most of our Aircraft are Fitted with them.It also reduces the Number of Gyros are combitations can be used.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
avioniker
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RE: B732 Autopilot Question

Tue Feb 20, 2007 10:08 pm

Believe it or not, lasar gyros are passe. Too expensive, the dithering system tends to be a weak link and there are other smaller, lighter, cheaper, and more reliable systems in use for the last five or so years.
The RC ProLine 21 AHS and the Honeywell ADIRU in the NG Boeing aircraft are good examples. Sextant/Thales has some pretty interesting stuff too.
With computers designing computers and hardware it's impossible to predict what'll be availablel in the next five years.
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One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
 
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HAWK21M
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RE: B732 Autopilot Question

Sat Feb 24, 2007 8:30 pm

Quoting Avioniker (Reply 10):
The RC ProLine 21 AHS and the Honeywell ADIRU in the NG Boeing aircraft are good examples

Are these the options on the NGs.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
avioniker
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RE: B732 Autopilot Question

Sun Feb 25, 2007 1:28 am

The Honeywell ADIRU is installed as normal equipment in "N" registered NG's. I don't know what the export restrictions do to the non US purchases but THALES and others make some pretty good stuff too.
 Smile
One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533

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