Malabar PF56266-01 Coolant Top-Off Unit (C-TOU)
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The Malabar PF56266-01 Coolant Top-Off Unit (C-TOU) is used to top off fluids and fill/drain/bleed individual line-replacable units (LRUs) in the B787 liquid coolant system (LCS). The unit consists of a clean fluid reservoir, hand pump assembly, filter assembly, pressure gauge, fluid supply hose with sight glass. The female coupler on the delivery hose connects with a mating male nipple on top of the clean reservoir to permit purging of air in the hose prior to use. The level gauge on front of the clean reservoir indicates the fluid level in the reservoir.
A B787 aircraft adapter kit (K21016-129 or a Boeing-approved equivalent) is required to connect the Malabar C-TOU for any aircraft service operation. Consult the Boeing 787-8 or 787-9 maintenance documentation for adapter kit and servicing information. Boeing adapter kits must be purchased from Boeing-approved sources (like Malabar).
Specifications
- Fluid: BMS3-42
- Clean Fluid Capacity: 2 U.S. gallons (7.6 liters)
- Waste Fluid Capacity: 2 quarts (1.9 liters)
- Filter Rating: 3-micron absolute
- Pump Outlet Pressure: 65 PSIG (448 kPa)
- Relief Valve Set: 70 PSIG (482 kPa)
- Volume Per Stroke: 1.8 cu. in. (29.6 cc)
- Delivery Hose Length: 120" (305 cm)
Recommended Spares/Filters:
- 481-112 – Filter Element
- 55933-216 – Piston Seal
- 55931-216 – Wiper
- 55933-110 – Rod Seal
- 482-120 – Pressure Gauge
- PF56273 – Hose Assembly
- PF56266PK – Repair Parts Kit
| General Information | |
|---|---|
| Part # | PF56266-01 |
| Manufacturer | Malabar |
| Manual 1 | View PF56266-01 Maintenance Manual |
| Shipping Information | |
|---|---|
| ECCN | EAR99 |
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AIRCRAFT COMPATIBILITY
| Compatible Aircraft* | |
|---|---|
| Boeing | 787 |
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QUESTIONS & ANSWERS
There is no fixed overhaul schedule for the PF56266-01 pump assembly, as the service life depends largely on how frequently the unit is operated. The most common wear points are the moving piston seal, wiper, and rod seal, which may begin to show signs of leakage past the piston or rod as they wear.
If leakage is detected, these seals should be replaced immediately to maintain proper performance and prevent further damage. To minimize downtime, Malabar offers a repair parts kit (PF56266PK), which is recommended to keep in stock at your facility for timely seal replacement and ongoing maintenance support.
Filter replacement intervals depend on the unit’s operating environment and frequency of use. As a general guideline, filters should be changed every three to four months to maintain proper flow and protect the pump assembly.
If you notice increased resistance on the pumping stroke at low pressure, the filter may already be restricted and should be replaced sooner. Regular filter changes help ensure consistent performance, extend the service life of the unit, and reduce the risk of contamination in the coolant system.
