|Quoting Sfomb67 (Reply 30):|
As far as I know, all DC-8's (-71 &73 included) used their inboard T/R's, inflight, to slow the acft down.
You're right, all DC-8s, series 10 thru 70 could use their inboard thrust reversers in flight. Some DC-8s could also use the outboard engine thrust reversers in flight as well. For anyone that's interested, here's some info I dug out from the "limitations" section of an older UA
DC-8 manual, an even older Douglas flight manual and a Kalitta operations manual:
-Maximum speed for extending thrust brakes - 390 kts. or M = .88
-Thrust reversers must not be used in flight below a speed of 200 knots (Kalitta manual states 190 knots).
-Wing flaps must be completely retracted for all inflight thrust brake operations.
---Maximum thrust usable during thrust brake operation is as follows:
-Engines #1 and #4:
-thrust brake stop limit for JT3C engines (DC-8-10) - idle reverse.
-thrust brake stop limit for JT4A engines (used on DC-8-20 and DC-8-30) - Approx. 31% max continuous.
-on JT3D powered airplanes N8044U-N8055U (some DC-8-50) and N8066U-N8099U (again, some -50 series and all of the -61 series) power settings up to idle reverse available with gear extended.
-on all other JT3D (and all CFM56) powered airplanes, mechanical stop prevents inflight use (some -50 series and ALL
-62 series, and also is the case with the -63 and with all -70 series).
--Engines #2 and #3:
-maximum continuous thrust for JT3C engines (series -10)
-maximum continuous thrust for JT4A engines (series -20 and -30)
-maximum continuous thrust for JT3D engines (series -50 thru -60)
-maximum continuous thrust for CFM56 engines (series -70)
-Sorry, no specific info for the -40 series.