Narrative:

After being cleared for a visual approach to runway 7; the roll splr inbd hydraulic and #1 hydraulic iso vlv caution lights illuminated intermittently. I referenced the roll splr inbd hydraulic checklist while the first officer (first officer) continued to set up for the approach. Hydraulic pressures were normal. I completed the checklist; just as the first officer called for flaps and gear for landing. We configured normally and landed the aircraft; but did not have normal braking available after landing. Did not have any trouble slowing and stopping the aircraft with props and parking brake. Nosewheel steering was still operable; so we cleared the runway; shutdown; and called for a tow to the gate.after landing we realized that we hadn't completed the #1 hydraulic iso vlv checklist prior to landing. That checklist would have alerted us to the loss of normal braking prior to landing; which would have been nice to know; and would have motivated us to declare an emergency; which we hadn't done.I had originally intended to address both caution lights; and chose to do the roll splr inbd hydraulic checklist first. I should have asked the first officer to delay the approach so we would have had more time to assess the problem; (which; it turns out; was a leak in the #1 hydraulic system) and complete all appropriate checklists. By the time I had completed the roll splr inbd hydraulic checklist; it was time to configure for landing; which completely distracted me from my initial intention of addressing the #1 hydraulic iso vlv checklist. In reviewing the checklist after landing; we could see that the only difference it would have made is that we would have been alerted to the loss of normal braking beforehand; and could have declared an emergency prior to landing. So I would say that task saturation would be a contributing cause to our not addressing the #1 hydraulic iso vlv checklist prior to landing.

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Original NASA ASRS Text

Title: A Q400 ROLL SPLR INBD HYD and #1 HYD ISO VLV caution lights illuminated intermittently so the QRH was partially completed prior to landing. After landing with no brakes or nose wheel steering; the crew realized they had not completed the checklists which would have alerted a hydraulic system leak.

Narrative: After being cleared for a visual approach to Runway 7; the ROLL SPLR INBD HYD and #1 HYD ISO VLV caution lights illuminated intermittently. I referenced the ROLL SPLR INBD HYD checklist while the First Officer (FO) continued to set up for the approach. Hydraulic pressures were normal. I completed the checklist; just as the FO called for flaps and gear for landing. We configured normally and landed the aircraft; but did not have normal braking available after landing. Did not have any trouble slowing and stopping the aircraft with props and parking brake. Nosewheel steering was still operable; so we cleared the runway; shutdown; and called for a tow to the gate.After landing we realized that we hadn't completed the #1 HYD ISO VLV checklist prior to landing. That checklist would have alerted us to the loss of normal braking prior to landing; which would have been nice to know; and would have motivated us to declare an emergency; which we hadn't done.I had originally intended to address both caution lights; and chose to do the ROLL SPLR INBD HYD checklist first. I should have asked the FO to delay the approach so we would have had more time to assess the problem; (which; it turns out; was a leak in the #1 hydraulic system) and complete all appropriate checklists. By the time I had completed the ROLL SPLR INBD HYD checklist; it was time to configure for landing; which completely distracted me from my initial intention of addressing the #1 HYD ISO VLV checklist. In reviewing the checklist after landing; we could see that the only difference it would have made is that we would have been alerted to the loss of normal braking beforehand; and could have declared an emergency prior to landing. So I would say that task saturation would be a contributing cause to our not addressing the #1 HYD ISO VLV checklist prior to landing.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.