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B732 Autopilot Question  
User currently offlineYYZatcboy From Canada, joined Apr 2005, 1082 posts, RR: 0
Posted (7 years 7 months 1 week 1 hour ago) and read 2107 times:
AIRLINERS.NET CREW
CUSTOMER SERVICE & SUPPORT

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
12 replies: All unread, jump to last
 
User currently offlineTristarSteve From Sweden, joined Nov 2005, 4007 posts, RR: 34
Reply 1, posted (7 years 7 months 6 days 23 hours ago) and read 2095 times:

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.


User currently offlineYYZatcboy From Canada, joined Apr 2005, 1082 posts, RR: 0
Reply 2, posted (7 years 7 months 6 days 23 hours ago) and read 2094 times:
AIRLINERS.NET CREW
CUSTOMER SERVICE & SUPPORT

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
User currently offlineAmtrosie From United States of America, joined Jan 2005, 274 posts, RR: 0
Reply 3, posted (7 years 7 months 6 days 23 hours ago) and read 2093 times:

The VG's used for the autopilot are all electric Gyros. At least this is the case with e SP-77's

User currently offlineYYZatcboy From Canada, joined Apr 2005, 1082 posts, RR: 0
Reply 4, posted (7 years 7 months 6 days 23 hours ago) and read 2088 times:
AIRLINERS.NET CREW
CUSTOMER SERVICE & SUPPORT

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
User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 5, posted (7 years 7 months 6 days 4 hours ago) and read 1998 times:

http://www.b737.org.uk/glareshield.htm
The Sperry SP77 used Electric Gyros.
regds
MEL



Think of the brighter side!
User currently offlineYYZatcboy From Canada, joined Apr 2005, 1082 posts, RR: 0
Reply 6, posted (7 years 7 months 6 days 3 hours ago) and read 1991 times:
AIRLINERS.NET CREW
CUSTOMER SERVICE & SUPPORT

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
User currently offlineAvioniker From United States of America, joined Dec 2001, 1109 posts, RR: 11
Reply 7, posted (7 years 7 months 1 day 22 hours ago) and read 1867 times:

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
User currently offlineAtlamt From United States of America, joined Sep 2001, 240 posts, RR: 3
Reply 8, posted (7 years 7 months 1 day 21 hours ago) and read 1857 times:

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
User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 9, posted (7 years 7 months 1 day 10 hours ago) and read 1798 times:

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



Think of the brighter side!
User currently offlineAvioniker From United States of America, joined Dec 2001, 1109 posts, RR: 11
Reply 10, posted (7 years 7 months 1 day 5 hours ago) and read 1785 times:

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.
 Smile



One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 11, posted (7 years 6 months 3 weeks 6 days 7 hours ago) and read 1703 times:

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



Think of the brighter side!
User currently offlineAvioniker From United States of America, joined Dec 2001, 1109 posts, RR: 11
Reply 12, posted (7 years 6 months 3 weeks 6 days 2 hours ago) and read 1689 times:

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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